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The PSRFITS Definition File
The PSRFITS Definition File (Ver 5.4, May 12, 2014)


SIMPLE  =                    T / file does conform to FITS standard
BITPIX  =                    8 / number of bits per data pixel
NAXIS   =                    0 / number of data axes
EXTEND  =                    T / FITS dataset may contain extensions
COMMENT   FITS (Flexible Image Transport System) format defined in Astronomy and
COMMENT   Astrophysics Supplement Series v44/p363, v44/p371, v73/p359, v73/p365.
COMMENT   Contact the NASA Science Office of Standards and Technology for the
COMMENT   FITS Definition document #100 and other FITS information.
COMMENT
HDRVER  = '5.4             '   / Header version 
FITSTYPE= 'PSRFITS         '   / FITS definition for pulsar data files
DATE    = '                '   / File creation date (YYYY-MM-DDThh:mm:ss UTC)
OBSERVER= '                '   / Observer name(s)
PROJID  = '                '   / Project name
TELESCOP= '                '   / Telescope name
ANT_X   =                    * / [m] Antenna ITRF X-coordinate (D)
ANT_Y   =                    * / [m] Antenna ITRF Y-coordinate (D)
ANT_Z   =                    * / [m] Antenna ITRF Z-coordinate (D)
FRONTEND= '                '   / Receiver ID
IBEAM   = '                '   / Beam ID for multibeam systems
NRCVR   =                    * / Number of receiver polarisation channels
FD_POLN = '                '   / LIN or CIRC
FD_HAND =                    * / +/- 1. +1 is LIN:A=X,B=Y, CIRC:A=L,B=R (I)
FD_SANG =                    * / [deg] FA of E vect for equal sig in A&B (E)
FD_XYPH =                    * / [deg] Phase of A^* B for injected cal (E)
BACKEND = '                '   / Backend ID
BECONFIG= '                '   / Backend configuration file name
BE_PHASE=                    * / 0/+1/-1 BE cross-phase:0 unknown,+/-1 std/rev
BE_DCC  =                    * / 0/1 BE downconversion conjugation corrected
BE_DELAY=                    * / [s] Backend propn delay from digitiser input 
TCYCLE  =                    * / [s] On-line cycle time (D)
OBS_MODE= '                '   / (PSR, CAL, SEARCH)
DATE-OBS= '                '   / Date of observation (YYYY-MM-DDThh:mm:ss UTC)
OBSFREQ =                    * / [MHz] Centre frequency for observation
OBSBW   =                    * / [MHz] Bandwidth for observation
OBSNCHAN=                    * / Number of frequency channels (original)
CHAN_DM =                    * / [cm-3 pc] DM used for on-line dedispersion
PNT_ID  = '                '   / Name or ID for pointing ctr (multibeam feeds)
SRC_NAME= '                '   / Source or scan ID 
COORD_MD= '                '   / Coordinate mode (J2000, GALACTIC, ECLIPTIC)
EQUINOX =                    * / Equinox of coords (e.g. 2000.0) 
RA      = '                '   / Right ascension (hh:mm:ss.ssss)
DEC     = '                '   / Declination (-dd:mm:ss.sss)
BMAJ    =                    * / [deg] Beam major axis length
BMIN    =                    * / [deg] Beam minor axis length
BPA     =                    * / [deg] Beam position angle
STT_CRD1= '                '   / Start coord 1 (hh:mm:ss.sss or ddd.ddd)
STT_CRD2= '                '   / Start coord 2 (-dd:mm:ss.sss or -dd.ddd) 
TRK_MODE= '                '   / Track mode (TRACK, SCANGC, SCANLAT)
STP_CRD1= '                '   / Stop coord 1 (hh:mm:ss.sss or ddd.ddd)
STP_CRD2= '                '   / Stop coord 2 (-dd:mm:ss.sss or -dd.ddd) 
SCANLEN =                    * / [s] Requested scan length (E)
FD_MODE = '                '   / Feed track mode - FA, CPA, SPA, TPA
FA_REQ  =                    * / [deg] Feed/Posn angle requested (E)
CAL_MODE= '                '   / Cal mode (OFF, SYNC, EXT1, EXT2)
CAL_FREQ=                    * / [Hz] Cal modulation frequency (E)
CAL_DCYC=                    * / Cal duty cycle (E)
CAL_PHS =                    * / Cal phase (wrt start time) (E)
CAL_NPHS=                    * / Number of states in cal pulse (I)
STT_IMJD=                    * / Start MJD (UTC days) (J - long integer)
STT_SMJD=                    * / [s] Start time (sec past UTC 00h) (J)
STT_OFFS=                    * / [s] Start time offset (D)   
STT_LST =                    * / [s] Start LST (D)
END
#
###############################################################################
#
# History Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Processing history *****
BITPIX  =                    8 / N/A
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                   23 / number of fields per row
#
EXTNAME = HISTORY             / name of this binary table extension
#
TTYPE#  = DATE_PRO            / Processing date and time (UTC)
TFORM#  = 24A                 / 24-char string
TTYPE#  = PROC_CMD            / Processing program and command
TFORM#  = 256A                / 256-char string
TTYPE#  = SCALE               / Units (FluxDen/RefFlux/Jansky)
TFORM#  = 8A                  / 8-char string
TTYPE#  = POL_TYPE            / Polarisation identifier
TFORM#  = 8A                  / 8-char string
TTYPE#  = NSUB                / Number of Sub-Integrations
TFORM#  = 1J                  / Long integer
TTYPE#  = NPOL                / Number of polarisations
TFORM#  = 1I                  / Integer
TTYPE#  = NBIN                / Nr of bins per product (0 for SEARCH mode)
TFORM#  = 1I                  / Integer
TTYPE#  = NBIN_PRD            / Nr of bins per period
TFORM#  = 1I                  / Integer
TTYPE#  = TBIN                / Time per bin or sample
TUNIT#  = s                   / units of field
TFORM#  = 1D                  / Double
TTYPE#  = CTR_FREQ            / Band centre frequency (weighted)
TUNIT#  = MHz                 / units of field
TFORM#  = 1D                  / Double
TTYPE#  = NCHAN               / Number of frequency channels
TFORM#  = 1J                  / Long integer
TTYPE#  = CHAN_BW             / Channel bandwidth
TFORM#  = 1D                  / Double
TUNIT#  = MHz                 / units of field
TTYPE#  = DM                  / DM used for dedispersion
TFORM#  = 1D                  / Double
TUNIT#  = CM-3 PC             / units of field
TTYPE#  = RM                  / RM used for RM correction
TFORM#  = 1D                  / Double
TUNIT#  = RAD M-2             / units of field
TTYPE#  = PR_CORR             / Projection of receptors onto sky corrected
TFORM#  = 1I                  / Integer flag 
TTYPE#  = FD_CORR             / Feed basis correction applied
TFORM#  = 1I                  / Integer flag 
TTYPE#  = BE_CORR             / Backend correction applied
TFORM#  = 1I                  / Integer flag 
TTYPE#  = RM_CORR             / RM correction applied
TFORM#  = 1I                  / Integer flag 
TTYPE#  = DEDISP              / Data dedispersed
TFORM#  = 1I                  / Integer flag 
TTYPE#  = DDS_MTHD            / Dedispersion method
TFORM#  = 32A                 / 32-char string
TTYPE#  = SC_MTHD             / Scattered power correction method
TFORM#  = 32A                 / 32-char string
TTYPE#  = CAL_MTHD            / Calibration method
TFORM#  = 32A                 / 32-char string
TTYPE#  = CAL_FILE            / Name of gain calibration file
TFORM#  = 256A                / 256-char string
TTYPE#  = RFI_MTHD            / RFI excision method
TFORM#  = 32A                 / 32-char string
TTYPE#  = RM_MODEL            / Auxiliary Faraday rotation model description
TFORM#  = 32A                 / 32-char string
TTYPE#  = AUX_RM_C            / Auxiliary Faraday rotation corrected flag
TFORM#  = 1I                  / Integer flag 
TTYPE#  = DM_MODEL            / Auxiliary dispersion model description
TFORM#  = 32A                 / 32-char string
TTYPE#  = AUX_DM_C            / Auxiliary dispersion corrected flag
TFORM#  = 1I                  / Integer flag
END
#
###############################################################################
#
# Observation Description Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Observation Description *****
BITPIX  =                    8 / N/A 
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    1 / Number of fields per row
#
EXTNAME = OBSDESCR             / Name of this binary table extension
#
TTYPE#  = DESCR                / Text file stored row by row
TFORM#  = 128A                 / Allow 128 char per row
END
#
###############################################################################
#
# Ephemeris Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Pulsar ephemeris *****
BITPIX  =                    8 / N/A 
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    1 / Number of fields per row
#
EXTNAME = PSRPARAM             / Name of this binary table extension
#
TTYPE#  = PARAM                / Text file stored row by row
TFORM#  = 128A                 / Allow 128 char per row
END
#
###############################################################################
#
# TEMPO1 Polyco History Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Polyco history *****
BITPIX  =                    8 / N/A 
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                   13 / Number of fields per row
#
EXTNAME = POLYCO               / name of this binary table extension
#
TTYPE#  = DATE_PRO             / Polyco creation date and time (UTC)
TFORM#  = 24A                  / 24-char string
TTYPE#  = POLYVER              / Polyco version ID
TFORM#  = 16A                  / 16-char string
TTYPE#  = NSPAN                / Span of polyco block in min
TFORM#  = 1I                   / Integer
TTYPE#  = NCOEF                / Nr of coefficients (<=15)
TFORM#  = 1I                   / Integer
TTYPE#  = NPBLK                / Nr of blocks (rows) for this polyco
TFORM#  = 1I                   / Integer
TTYPE#  = NSITE                / Observatory code
TFORM#  = 8A                   / 8-char string
TTYPE#  = REF_FREQ             / Reference frequency for phase
TFORM#  = 1D                   / Double
TUNIT#  = MHz                  / Units of field
TTYPE#  = PRED_PHS             / Predicted pulse phase at observation start
TFORM#  = 1D                   / Double
TTYPE#  = REF_MJD              / Reference MJD
TFORM#  = 1D                   / Double
TTYPE#  = REF_PHS              / Reference phase
TFORM#  = 1D                   / Double
TTYPE#  = REF_F0               / Zero-order pulsar frequency
TFORM#  = 1D                   / Double
TUNIT#  = Hz                   / Units of field
TTYPE#  = LGFITERR             / Log_10 of polynomial fit rms error in periods
TFORM#  = 1D                   / Double
TTYPE#  = COEFF                / Polyco coefficients
TFORM#  = 15D                  / NCOEF doubles
END
#
###############################################################################
#
# TEMPO2 Predictor Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Tempo2 Predictor *****
BITPIX  =                    8 / N/A 
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    1 / Number of fields per row
#
EXTNAME = T2PREDICT            / Name of this binary table extension
#
TTYPE#  = PREDICT              / Text file stored row by row
TFORM#  = 128A                 / Allow 128 char per row
END
#
###############################################################################
#
# Coherent Dedispersion Parameters Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Coherent Dedispersion Parameters *****
BITPIX  =                    8 / N/A
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows in table (NCHAN)
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    3 / number of fields per row
#
EXTNAME = COHDDISP             / name of this binary table extension
#
DOMAIN  =                    * / Coherent dedisp domain (TIME/FREQ)
CHRPTYPE=                    * / Chirp function descriptor
DM      =                    * / [cm-3 pc] DM used for coherent dedispersion
DOPPLER =                    * / [v/c] Doppler correction factor
DATANBIT=                    * / Number of quantization levels for data
CHRPNBIT=                    * / Number of quantization levels for chirp
NCHAN   =                    * / Number of input frequency channels
TTYPE#  = FREQ                 / Center frequency of input channel
TFORM#  = 1D                   / Double
TUNIT#  = MHz                  / Units of field
TTYPE#  = BW                   / Bandwidth of input channel
TFORM#  = 1D                   / Double
TUNIT#  = MHz                  / Units of field
TTYPE#  = OUT_NCHAN            / Number of output frequency channels
TFORM#  = 1J                   / Long integer
TTYPE#  = OUT_FREQ             / Center frequency of each output channel
TFORM#  = 1D                   / OUT_NCHAN double
TUNIT#  = MHz                  / Units of field
TTYPE#  = OUT_BW               / Bandwidth of each output channel
TFORM#  = 1D                   / OUT_NCHAN doubles or one double for all
TUNIT#  = MHz                  / Units of field
TTYPE#  = NCHIRP               / Number of complex samples in FFT or FIR filter
TFORM#  = 1J                   / OUT_NCHAN long int or one long int for all
TTYPE#  = NCYC_POS             / Number of complex samples discarded from start
TFORM#  = 1J                   / OUT_NCHAN long int or one long int for all
TTYPE#  = NCYC_NEG             / Number of complex samples discarded from end
TFORM#  = 1J                   / OUT_NCHAN long int or one long int for all
END
#
###############################################################################
#
# Original Bandpass Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Original bandpasses *****
BITPIX  =                    8 / N/A
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    3 / number of fields per row
#
NCH_ORIG=                    * / Number of channels in original bandpass
BP_NPOL =                    * / Number of polarizations in bandpass
EXTNAME = BANDPASS             / name of this binary table extension
#
TTYPE#  = DAT_OFFS             / Data offset for each bandpass
TFORM#  = E                    / BP_NPOL floats
TTYPE#  = DAT_SCL              / Data scale factor: Val=Data*DAT_SCL + DAT_OFFS
TFORM#  = E                    / BP_NPOL floats
TTYPE#  = DATA                 / Bandpass for autocorrelations
TDIM#   = (*,*)                / Data table dimensions = (NCH_ORIG,BP_NPOL)
TFORM#  = I                    / NCH_ORIG*BP_NPOL integers
TUNIT#  = Jy                   / Bandpass amplitude units
END
#
###############################################################################
#
# Flux Calibration Data Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Flux Calibration Data *****
BITPIX  =                    8 / N/A 
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    6 / Number of fields per row
#
EXTNAME = FLUX_CAL             / name of this binary table extension
CAL_MTHD=                      / Flux cal method
SCALFILE=                      / Cal file(s) used to derive flux-cal data
NCHAN   =                    * / Nr of frequency channels (I)
NRCVR   =                    * / Number of polarisation channels (I)
EPOCH   =                      / [MJD] Epoch of calibration obs
#
TTYPE#  = DAT_FREQ             / Centre frequency for each channel
TFORM#  = D                    / NCHAN doubles
TUNIT#  = MHz                  / Units of field
TTYPE#  = DAT_WTS              / Weights for each channel
TFORM#  = E                    / NCHAN floats
TTYPE#  = S_SYS                / System equiv. flux density for each rcvr chan.
TDIM#   = (*,*)                / Dimensions (NCHAN,NRCVR)
TFORM#  = E                    / NCHAN*NRCVR floats
TUNIT#  = Jy        
TTYPE#  = S_SYSERR             / Est. error of system equiv. flux density
TDIM#   = (*,*)                / Dimensions (NCHAN,NRCVR)
TFORM#  = E                    / NCHAN*NRCVR floats
TUNIT#  = Jy        
TTYPE#  = S_CAL                / Calibrator flux density for each rcvr channel
TDIM#   = (*,*)                / Dimensions (NCHAN,NRCVR)
TFORM#  = E                    / NCHAN*NRCVR floats
TUNIT#  = Jy        
TTYPE#  = S_CALERR             / Estimated error of calibrator flux density
TDIM#   = (*,*)                / Dimensions (NCHAN,NRCVR)
TFORM#  = E                    / NCHAN*NRCVR floats
TUNIT#  = Jy      
END
#
###############################################################################
#
# Artificial Calibrator Stokes Parameters Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Artificial Calibrator Stokes Data *****
BITPIX  =                    8 / N/A 
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    3 / Number of fields per row
#
EXTNAME = CAL_POLN             / name of this binary table extension
NCHAN   =                    * / Nr of channels in flux cal file
#
TTYPE#  = DAT_WTS              / Weights for each channel
TFORM#  = E                    / NCHAN floats
TTYPE#  = DATA                 / Stokes (Q,U,V) of calibrator rel. to Cal I
TDIM#   = (*,*)                / Dimensions (3,NCHAN)
TFORM#  = E                    / 3*NCHAN floats
TTYPE#  = DATAERR              / Estimated error of Stokes (Q,U,V)
TDIM#   = (*,*)                / Dimensions (3,NCHAN)
TFORM#  = E                    / 3*NCHAN floats
END
#
###############################################################################
#
# Feed Cross-Coupling Parameters Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Feed Cross-Coupling parameters *****
BITPIX  =                    8 / N/A 
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes
NAXIS2  =                    * / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    3 / Number of fields per row
#
EXTNAME = FEEDPAR              / Name of this binary table extension
CAL_MTHD= '                  ' / Cross-coupling method
NCPAR   =                    * / Number of coupling parameters
NCOVAR  =                    * / Number of parameter covariances
NCHAN   =                    * / Nr of channels in Feed coupling data
EPOCH   = '                  ' / [MJD] Epoch of calibration obs
#
TTYPE#  = DAT_FREQ             / [MHz] Centre frequency for each channel
TFORM#  = D                    / NCHAN doubles
TUNIT#  = MHz                  / Units of field
TTYPE#  = DAT_WTS              / Weights for each channel
TFORM#  = E                    / NCHAN floats
TTYPE#  = DATA                 / Cross-coupling data
TDIM#   = (*,*)                / Dimensions (NCPAR,NCHAN)
TFORM#  = E                    / NCPAR*NCHAN floats
TTYPE#  = DATAERR              / Estimated error of cross-coupling data
TDIM#   = (*,*)                / Dimensions (NCPAR,NCHAN)
TFORM#  = E                    / NCPAR*NCHAN floats
TTYPE#  = COVAR                / Formal covariances of coupling data
TDIM#   = (*,*)                / Dimensions (NCOVAR,NCHAN)
TFORM#  = E                    / NCOVAR*NCHAN floats
TTYPE#  = CHISQ                / Total chi-squared (objective merit function)
TFORM#  = E                    / NCHAN floats
TTYPE#  = NFREE                / Number of degrees of freedom
TFORM#  = J                    / NCHAN long (32-bit) integers
END
#
###############################################################################
#
# Spectral Kurtosis Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Spectral Kurtosis *****
BITPIX  =                    8 / N/A
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / Width of table in bytes
NAXIS2  =                    * / Number of rows in table
PCOUNT  =                    0 / Size of special data area
GCOUNT  =                    1 / One data group (required keyword)
TFIELDS =                    * / Number of fields per row
#
NPOL    =                    * / Number of polarizations in SK data
NCHAN   =                    * / Number of channels in SK data 
EXTNAME = SPECKURT             / Name of this binary table extension
#
TTYPE#  = SK_INT               / Samples integrated in SK statistics
TFORM#  = V                    / unsigned integer
TTYPE#  = SK_EXCIS             / SK Excision limits 
TFORM#  = V                    / unsigned integer
TTYPE#  = FIL_SUM              / Filtered SK sum
TDIM#   = (*,*)                / Data table dimensions (NPOL*NCHAN)
TFORM#  = E                    / NPOL*NCHAN floats
TTYPE#  = FIL_HIT              / Filtered SK hits
TDIM#   = (*,*)                / Data table dimensions (NPOL*NCHAN)
TFORM#  = V                    / NPOL*NCHAN unsigned integers
TTYPE#  = UNFIL_SUM            / Unfiltered SK sum
TDIM#   = (*,*)                / Data table dimensions (NPOL*NCHAN)
TFORM#  = E                    / NPOL*NCHAN floats
TTYPE#  = UNFIL_HIT            / Unfiltered SK hits
TFORM#  = K                    / 64 bit signed integer
END
#
###############################################################################
#
# Subintegration data Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Subintegration data  *****
BITPIX  =                    8 / N/A
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / width of table in bytes 
NAXIS2  =                    * / Number of rows in table (NSUBINT)
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                   18 / Number of fields per row
# 
INT_TYPE= '                  ' / Time axis (TIME, BINPHSPERI, BINLNGASC, etc)
INT_UNIT= '                  ' / Unit of time axis (SEC, PHS (0-1), DEG) 
SCALE   = '                  ' / Intensity units (FluxDen/RefFlux/Jansky)
POL_TYPE= '                  ' / Polarisation identifier (e.g., AABBCRCI, AA+BB)
NPOL    =                    * / Nr of polarisations
TBIN    =                    * / [s] Time per bin or sample 
NBIN    =                    * / Nr of bins (PSR/CAL mode; else 1)
NBIN_PRD=                    * / Nr of bins/pulse period (for gated data)
PHS_OFFS=                    * / Phase offset of bin 0 for gated data
NBITS   =                    * / Nr of bits/datum (SEARCH mode data, else 1)
ZERO_OFF=                    * / Zero offset for SEARCH-mode data   
SIGNINT =                    * / 1 for signed ints in SEARCH-mode data, else 0
NSUBOFFS=                    * / Subint offset (Contiguous SEARCH-mode files)
NCHAN   =                    * / Number of channels/sub-bands in this file
CHAN_BW =                    * / [MHz] Channel/sub-band width
DM      =                    * / [cm-3 pc] DM for post-detection dedisperion
RM      =                    * / [rad m-2] RM for post-detection deFaraday
NCHNOFFS=                    * / Channel/sub-band offset for split files
NSBLK   =                    * / Samples/row (SEARCH mode, else 1) 
NSTOT   =                    * / Total number of samples (SEARCH mode, else 1) 
#
EXTNAME = SUBINT               / name of this binary table extension
#
TTYPE#  = INDEXVAL             / Optionally used if INT_TYPE != TIME
TFORM#  = 1D                   / Double
TTYPE#  = TSUBINT              / Length of subintegration
TFORM#  = 1D                   / Double 
TUNIT#  = s                    / Units of field
TTYPE#  = OFFS_SUB             / Offset from Start of subint centre
TFORM#  = 1D                   / Double 
TUNIT#  = s                    / Units of field
TTYPE#  = LST_SUB              / LST at subint centre 
TFORM#  = 1D                   / Double 
TUNIT#  = s                    / Units of field
TTYPE#  = RA_SUB               / RA (J2000) at subint centre
TFORM#  = 1D                   / Double 
TUNIT#  = deg                  / Units of field
TTYPE#  = DEC_SUB              / Dec (J2000) at subint centre
TFORM#  = 1D                   / Double 
TUNIT#  = deg                  / Units of field
TTYPE#  = GLON_SUB             / [deg] Gal longitude at subint centre
TFORM#  = 1D                   / Double 
TUNIT#  = deg                  / Units of field
TTYPE#  = GLAT_SUB             / [deg] Gal latitude at subint centre
TFORM#  = 1D                   / Double 
TUNIT#  = deg                  / Units of field
TTYPE#  = FD_ANG               / [deg] Feed angle at subint centre
TFORM#  = 1E                   / Float
TUNIT#  = deg                  / Units of field
TTYPE#  = POS_ANG              / [deg] Position angle of feed at subint centre
TFORM#  = 1E                   / Float
TUNIT#  = deg                  / Units of field
TTYPE#  = PAR_ANG              / [deg] Parallactic angle at subint centre
TFORM#  = 1E                   / Float
TUNIT#  = deg                  / Units of field
TTYPE#  = TEL_AZ               / [deg] Telescope azimuth at subint centre
TFORM#  = 1E                   / Float 
TUNIT#  = deg                  / Units of field
TTYPE#  = TEL_ZEN              / [deg] Telescope zenith angle at subint centre
TFORM#  = 1E                   / Float
TUNIT#  = deg                  / Units of field
TTYPE#  = AUX_DM               / additional DM (ionosphere, corona, etc.)
TFORM#  = 1D                   / Double
TUNIT#  = CM-3 PC              / units of field
TTYPE#  = AUX_RM               / additional RM (ionosphere, corona, etc.)
TFORM#  = 1D                   / Double
TUNIT#  = RAD M-2              / units of field
TTYPE#  = DAT_FREQ             / [MHz] Centre frequency for each channel
TFORM#  = D                    / NCHAN doubles
TUNIT#  = MHz                  / Units of field
TTYPE#  = DAT_WTS              / Weights for each channel
TFORM#  = E                    / NCHAN floats
TTYPE#  = DAT_OFFS             / Data offset for each channel
TFORM#  = E                    / NCHAN*NPOL floats
TTYPE#  = DAT_SCL              / Data scale factor (outval=dataval*scl + offs)
TFORM#  = E                    / NCHAN*NPOL floats
TTYPE#  = DATA                 / Subint data table
TDIM#   = (*,*,*)              / (NBIN,NCHAN,NPOL) or (NCHAN,NPOL,NSBLK*NBITS/8)
TFORM#  = I                    / I (Fold) or B (1-8 bit) Search
TUNIT#  = Jy                   / Units of subint data
END
#
###############################################################################
#
# Digitiser Statistics Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Digitiser statistics *****
BITPIX  =                    8 / N/A
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / Width of table in bytes
NAXIS2  =                    * / Number of rows in table (NSUBINT)
PCOUNT  =                    0 / Size of special data area
GCOUNT  =                    1 / One data group (required keyword)
TFIELDS =                    1 / Number of fields per row
#
DIG_MODE= '                '   / Digitiser mode
NDIGR   =                    * / Number of digitised channels (I)
NPAR    =                    * / Number of digitiser parameters
NCYCSUB =                    * / Number of correlator cycles per subint
DIGLEV  = '                '   / Digitiser level-setting mode (AUTO, FIX)
EXTNAME = DIG_STAT             / Name of this binary table extension
#
TTYPE#  = ATTEN                / Attenuator settings
TFORM#  = E                    / NDIGR floats
TUNIT#  = db                   / Units of field
TTYPE#  = DATA                 / Digitiser statistics
TDIM#   = (*,*,*)              / Data table dimensions (NPAR,NDIGR,NCYCSUB)
TFORM#  = E                    / NPAR*NDIGR*NCYCSUB floats
END
#
###############################################################################
#
# Digitiser Counts Binary Table Extension
#
###############################################################################
#
XTENSION= BINTABLE             / ***** Digitiser counts *****
BITPIX  =                    8 / N/A
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                    * / Width of table in bytes
NAXIS2  =                    * / Number of rows in table
PCOUNT  =                    0 / Size of special data area
GCOUNT  =                    1 / One data group (required keyword)
TFIELDS =                    3 / Number of fields per row
#
DIG_MODE= '                '   / Digitiser mode
DYN_LEVT=                    * / Timescale for dynamic leveling
NDIGR   =                    * / Number of digitised channels (I)
NLEV    =                    * / Number of digitiser levels
NPTHIST =                    * / Number of points in histogram (I)
DIGLEV  = '                '   / Digitiser level-setting mode (AUTO, FIX)
LEVSEPN =                    * / Separation of dig. threshold levels in rms
EXTNAME = DIG_CNTS             / Name of this binary table extension
#
TTYPE#  = DAT_OFFS             / Data offset for each histogram
TFORM#  = E                    / NDIGR floats
TTYPE#  = DAT_SCL              / Data scale factor for each histogram
TFORM#  = E                    / NDIGR floats
TTYPE#  = DATA                 / Digitiser count data
TDIM#   = (*,*)                / Data table dimensions (NPTHIST,NDIGR)         
TFORM#  = I                    / NPTHIST*NDIGR integers
END