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STSDAS Version 3.13 Patch 1 Release Notes

    There is a patch to STSDAS that affects CALWF3.  If you are
    using CALWF3, you should install STSDAS and then install
    the patch.
    Calwf3 v2.3 contains one minor and one major update.
     1) The CopyFFile routine was enhanced to ensure that the FILENAME keyword
	 value in all output files produced by calwf3 always matches the actual file name.
     2) The IR calibration step "zsigcorr", which is used to estimate the amount of signal
	 in each detector pixel in the zeroth read (the read the occurs immediately after the
	 pre-exposure reset) of an exposure, has been updated to fix a problem that
	 produced incorrect results for sub-array exposures. The estimated zeroth read
	 signal in sub-array exposures was being underestimated by factors of 2-4, due to
	 the fact that the effective exposure time of the zeroth read is variable across a
	 sub-array. The new algorithm no longers relies on the effective exposure time of
	 the zeroth read, so that accurate results are produced for sub-array exposures.
    STSDAS Version 3.13 Release Notes
    December 2010
    This release of STSDAS contains changes to the pipeline code for nearly
    all the instruments (STIS, NICMOS, WFC3 and COS).  In addition,
    the final software used by the ST-ECF to calibrate FOS data has been
    included strictly as a record of the processing performed to generate
    the FOS products available from the HST archive. 
    The specific changes are detailed in the following sections.
    Platform Support
    Binaries for this release were built on Red Hat Enterprise Linux 4
    and 5, Solaris 5.8, and Mac OS X 10.4 (PPC and Intel architecture).
    Binaries were built with IRAF 2.14, except for Solaris, which were
    built with IRAF 2.12.2a.  IRAF is available from
    Solaris Support Ending
    This version will be the last version which will be tested against
    Solaris.  We will also no longer be building Solaris binaries for STSDAS
    after this release, although the source code can always be downloaded
    and compiled locally as needed.
    64-bit IRAF Support
    IRAF 2.15 includes support for 64-bit systems. The changes necessary to
    support 64-bits generally require applications to be modified. We will
    only release 32-bit binaries fo the Tables and STSDAS packages for use
    with IRAF 2.15. Support for 32-bit binaries will continue as long as
    there are sufficient plaforms that such binaries will run on. We may
    only convert some packages in Tables and STSDAS to 64-bit version when
    the 32-bit versions are no longer viable and if created will be released
    as a separate package with a different name. When the 32-bit versions
    of TABLES and STSDAS are no longer viable, support for any tasks within
    those packages not ported to 64-bits will end.  The full description of
    this policy can be found online at:
    STECF Software
    This release contains the latest version of the stecf IRAF package for
    supporting HST data that had been developed by members of the Space
    Telescope European Coordinating Facility (ST-ECF) which closed on 31
    December 2010.
    The packages included in stecf are:
    imres - Tasks used for photometric image restoration with unconstrained star
	    positions, simulating images with ground-based seeing and making
	    apodizing mask images.
    impol - A package for imaging linear polarization mapping for data taken
	    using the polarimetry modes of HST instruments.  An overview and 
	    access to demos and help files is available at:
    specres - A package for point source extraction and background decomposition
	      of 2-D (longslit) spectra. An overview is provided at:
    Support for these packages may be obtained by contacting the STScI Help
    Desk at ''. These questions will then be forwarded to the
    package authors at ESO as required.
    The WFC3 calwf3 task has been updated to version 2.2, which includes
    the following changes:
    - The IR ZSIGCORR calibration step has been modified to perform the zero read
      signal calculation for all pixels, regardless of any data quality (DQ) flags
      associated with the pixels. The previous version skipped the calculation for
      pixels with a non-zero DQ value.
    - The logic to check for the existence of some of the calibration
      reference tables has been updated to provide useful error messages if
      the tables can't be found.
    - The logic for processing IR images has been updated to allow for re-entrant
      processing, in which a given image is processed through calwf3 multiple times,
      applying different sets of calibration steps in each pass.
    - The logic used to execute the WF3REJ task from within calwf3, which is used to
      combine multiple images from CR-SPLIT and REPEAT-OBS associations, has been
      upgraded to skip the step for products that only have one existing member.
    CALSTIS Version 2.32 (05-November-2010) has been updated for this release.
    The changes include:
       - There were several (internal) sets of functions for evaluating the
       dispersion relation, its derivative, or its inverse.  These have been
       consolidated to one set of functions.  A ninth term (spectral order
       squared) has also been added to the dispersion relation; this term may
       be used in the future for echelle data.
       - Prior to Servicing Mission 4 (SM4), the reference temperature and the
       slope of dark vs temperature for Side-2 CCD data were hard-coded.  Both
       the nominal temperature and the slope are different for post-SM4 data,
       so the hard-coded values are not appropriate for recent data.  The
       reference temperature and slope are now recorded in the primary header
       of the dark reference file, and calstis reads those values and uses them
       when computing the scaling factor for the CCD dark image.
       A new parameter has been added to indicate that x1dcorr should search
       for the target spectrum in the cross-dispersion direction, rather than
       relying on the keyword determined from wavecal processing.  Other new
       parameters allow the user to specify the extraction location and height.
	Final updates were made to the PyRAF script 'runcalsaa' which gets used to 
	apply the SAA and bright-earth corrections to NICMOS data after calibration
	by 'calnica'.  These updates insured that all NICMOS data results in a 
	consistent set of calibrated products when fully processed.
	Updated the markdq task to use all 15 DQ bits and updated some of the help
	files to reflect the fact that markdq and ndisplay can be used on more 
	than just NICMOS images.
    The following tasks and their help files were updated to allow them to be 
    used with WFC3/IR images as well as NICMOS data:
	- mosdisplay
	- pstats
	- pstack
	- sampinfo
    Updates were made to 'msstatistics' to fix ACS and WFC3 dq flag assignments. The help pages were also updated to include appropriate ACS, WFC3, and COS references. 
	The new parameter 'separation' has been activated in 'tweakshifts'
	to allow the 'separation' parameter in 'xyxymatch' to be set. This
	supports the use of closely spaced objects in the match.