MARCH 27, 2012

# CALCOS v2.17.5 Release Notes

This describes changes from calcos version 2.17.3 to 2.17.5.

### Relevant Trac tickets and PRs:

Trac PR Updates
761 69143 Calcos should flag gain-sagged regions in FUV data.
865 70786 Calcos needs a reasonable default value for x1dsum array size.

### Overview

The option to use a gsagtab to flag gain sagged regions has been implemented.

When averaging x1d tables to make an x1dsum table, there are several columns that contain arrays. If all the input x1d tables are empty, the array length was being set to 0, which is not a valid array length. The array length is now set to a positive value, at least 1 but usually the length of an FUV or NUV x1d array.

### Details

Changes to calcos.py:

The changes that had been made to calcos 2.17.3 to disable use of the gain sag table (GSAGTAB) have been removed. In particular, gsagtab has been added to the temp dictionary in missingRefFiles, and a check on its existence has been added just after checking for bpixtab.
Trac #761, PR 69143

Changes to cosutil.py:

In getDQArrays, the gain sag table will be used for all FUV data, not just for TIME-TAG data.
Trac #761, PR 69143

Changes to getinfo.py:

Function getRefFileNames was modified to remove the code that set reffiles["gsagtab"] to "N/A".
Trac #761, PR 69143

Changes to fpavg.py:

In __init__ for OutputX1D, self.output_nelem is initialized to 1, instead of to 0.  In method computeOutputInfo, if the input spectra are empty, self.output_nelem is set to the extended array length (16384 for FUV, 1274 for NUV) instead of to 0.  If there are input spectra, self.output_nelem will only be updated if the computed value for the number of elements is greater than zero, not just greater than or equal to zero. The problem was that self.output_nelem is used to set the array length for x1dsum columns
that are arrays, and zero is not a valid length.
Trac #865, PR 70786

#### Please Contact the HST Help Desk with any Questions

https://hsthelp.stsci.edu