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Release Notes for STSDAS 3.5

27 March 2006

This release of STSDAS contains changes to SYNPHOT, NICMOS,
CALSTIS, CALACS, aXe, MultiDrizzle, and the DITHER package. There
were also changes made to support compilation of the code under new
compilers on several platforms. A new task has been added; namely,
PUFTCORR in the NICMOS package. Several deprecated packages and tasks
were removed; specifically, focgeom and the prototype versions of
PyDrizzle and MultiDrizzle. The specific changes are detailed in
the following sections.


Platform support
================
Binaries for this release were built on Red Hat Enterprise Linux 3,
Solaris 5.8, and Mac OS X 10.3.9.


Libraries
=========
No changes have been implemented in any of the libraries provided
with STSDAS.


HST_CALIB.SYNPHOT
=================

- Corrected throughput files available.

New throughput files for several non-HST bandpasses are available at:

ftp://ftp.stsci.edu/pub/software/stsdas/refdata/synphot/synphot1.tar.Z

NOTE: You can insure that you have the new files by verifying that the
date for this file, synphot1.tar.Z, is after 1-March-2006.

The filter throughput functions for Johnson UBV, StrÓÆmgren uvby,
Cousins RI, and Landolt UBVRI (= Johnson UBV + Cousins RI) have been
adapted according to the results of MaÓ-z ApellÓÅniz 2006 (AJ 131, 1184)
to include the following changes:

- The old throughput functions were expressed in energy-integrating
form, as opposed to the photon-counting that should always be used in
synphot. This error has been corrected.

- New throughput functions for Johnson U (= Landolt U) and StrÓÆmgren
u have been calculated using STIS observations. The new functions
introduce changes in the short-wavelength cutoff caused by the
atmosphere. Also, for the case of Johnson colors, it corrects the
unphysical definition of two different B bandpasses depending on
whether U-B or B-V is calculated.

Users should expect differences of up to several hundredths of
magnitudes when comparing old and new synphot results that include
those filters.

In addition, one should remember that when comparing synthetic
Johnson, StrÓÆmgren, Cousins, or Landolt vegamag magnitudes with
observed data, a zero point needs to be added. Synphot does not
include this additional step, which needs to be done by the
user.

The following table shows the recommended zero points:

-----------------------------------------
Filter/Color/Index Zeropoint Reference
(mag)
-----------------------------------------
Johnson/Landolt V 0.026 1
Johnson/Landolt B-V 0.010 2
Johnson/Landolt U-B 0.020 2
Cousins/Landolt V-R -0.012 3
Cousins/Landolt V-I -0.002 3
StrÓÆmgren y 0.038 3
StrÓÆmgren b-y 0.007 2
StrÓÆmgren m_1 0.154 2
StrÓÆmgren c_1 1.092 2
-----------------------------------------
1. Bohlin & Gilliland 2004 (AJ 127, 3508).
2. MaÓ-z ApellÓÅniz 2006 (AJ 131, 1184).
3. Holberg & Bergeron 2006 (AJ, submitted).



- Countrate documentation
Language in the help file that described the passband specification
for the countrate.magnitude parameter was corrected. The original
language implied that Johnson bands were always used. The
description was corrected to explain the Johnson/Cousins/Bessell
convention actually in use. The language was expanded to indicate
how to fully specify a bandpass supported by synphot; eg, johnson,r
or sdss,g. The examples provided in this documentation were also
updated to refer to FITS files instead of STSDAS tables for the BPGS
reference spectra, since they have all been replaced by FITS versions.



HST_CALIB.NICMOS
================
- SAACLEAN
Significant algorithmic and error handling improvements have been made
in SAACLEAN. Changes were also made to the SAACLEAN task parameters;
- The GAINPLOT parameter was removed, and the value is now taken from
the ADCGAIN keyword in header.
- CRTHRESH,NOISETHRESH,BINSIGFRAC were added to replace previously
hardcoded parameters.
- The parameters were reordered so that all the saaper-related parameters
occur together.
- The INFILE parameter was replaced by two new parameters for input files:
CALCIMAGE is the image from which the SAA correction is calculated, and
TARGIMAGE is the image to which the correction will be applied.
- A CLOBBER parameter was added to permit overwriting existing
files. This parameter was added as a "query" parameter, so it
will explicitly ask the user if it was not explicitly set. This
permits the correction to be applied in place (if OUTPUT is the
same as TARGIMAGE), as well as permitting other diagnostic files,
persistence model files, etc, to be overwritten.
- 2 new parameters, HISTBINWIDTH and NCLIP, were added. These are
passed to imagestats when analyzing the saa persistence image
histogram to compute the threshold separating the high and low
signal domains.

The help file for this task was also updated:
- The help file was modified to reflect new "query" status of saaperfile
parameter. An example was also removed (since SAAPERFILE is
now required).
- Help files were updated to reflect changes to task parameters.
- A discussion was updated to describe several new parameters which were
added to the task in an earlier version. References to "pedsky"
were replaced with "pedsub" throughout, since "pedsub" is more robust
and less sensitive to the characteristics of the data. In general,
we recommend the use of "pedsub" for pedestal correction.


- PUFTCORR
This new task was added to the NICMOS package to support correction of
the 'Mr. StayPuft' artifact in NICMOS exposures.

This task has been included as a beta release to be run on an
'as-is' basis. Any feedback on how this task performs would be
appreciated and used to improve the final release version of this
task in the next public release.

- ITERSTAT
The new parameter 'npix' was added to the list of output parameters.



PLAYPEN
=======
- ILS
Warning messages from compilation were removed by correcting a problem
with how the function 'il_bclean' was defined.


HST_CALIB.STIS
==============
-CALSTIS
CALSTIS has been updated to Version 2.20.

The expression for correcting for CTE loss was modified to include a
term for the "red halo" for G750L or G750M data.

Two new columns, HALOFAC and HALOMINFRAC, are now read in from
the CCDTAB (if they are present).

- X2D
The algorithm for interpolating the error estimates (the ERR
extension) has been modified. With the previous algorithm, when
the interpolated value was an average over several pixels, the
result would have a lower error than the input value. The new
algorithm is based on the principle that when a user sums over an
area in an interpolated image and adds the errors in quadrature,
the resulting error estimate for the summed flux should be
essentially the same as the result that would be obtained for
an equivalent area in the original uninterpolated image. A new
parameter, ERR_ALG, was added to the x2d task to give the option
of using the previous algorithm; the default is to use the new
algorithm.


HST_CALIB.ACS
=============
CALACS was updated to Version 4.6.1.

An error in assigning IDs to sub-products when ASN members are
missing was fixed. Sub-products are now assigned an ID while
missing members are not.


HST_CALIB.ACS.AXE
=================
The version of aXe distributed with the ACS package was updated to
Version 1.5.1.

More details on the specific changes included in aXe-1.5.1, as well as
the user manual, can be found at:

http://www.stecf.org/software/aXe/


ANALYSIS
========

- DRIZZLE

- 'drizzle' code was corrected to properly run 'sinc' kernel for
blotting. This upgraded 'callable blot' to '0.6' and STSDAS blot
to 3.4.1.


- MultiDrizzle

MultiDrizzle has been updated to version 2.7.2.

The primary changes include:
- New parameters FINAL_UNITS and UPDATEWCS have been added
to the interface. The new FINAL_UNITS parameter allows the
user to produce drizzled products which have either units of
electrons/sec or DN. The UPDATEWCS parameter turns on or off
the use of 'makewcs', and when turned off will not modify the
WCS keywords for the input images.
- MultiDrizzle was modified to treat ACS (and STIS) images which
have NGOODPIX == 0 as if they had EXPTIME==0. This usually only
happens when the entire image gets saturated as detected by CALACS
(or CALSTIS), and would cause 'createMedian' to crash when included.
- Output crmask file now gets written out explicitly as a UInt8 array
instead of platform-specific INT. (64-bit support issue)
- In the driz_cr module, a message was added to warn users that the
SNR and scale parameters only use 2 input values when more than two
values are provided. This was done to address an issue where users
believed that they could input any number of values.