... Pols: The number of polarizations used. ... See specrometer specs for more info. dump : When taking spectra this is the integration of a single spectra (or group of 4 spectra if stokes). field: A fits row contains multiple fields. ... The other fields in the row usually contain values for the first dump of the row. ... Each pdev spectrometer box will handle 1 alfa beam, 300 Mhz all pols. ... beam_offaz/za,rfeed_offaz/za, prfeed_offaz/za, beam_offra/dec, alfa_ang are used for alfa. beam_offaz . ...