I/O Bugs: syserrors

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11 Nov 2008

These are the webpages relative to Sherpa in the CIAO 3.4 release (18 December 2006). They are no longer actively updated, however the CXC will continue limited support of CIAO 3.4 for the near future.

15 Dec 2008

The newest version of the Chandra Interactive Analysis of Observations software, is CIAO 4.1, released on 15 December 2008. Read the release notes for detailed information. This release requires that CALDB 4.1.0 be installed for the software to work correctly.

Bugs

Sherpa will not read in systematic errors unless the input file has a SYS_ERR keyword with a non-zero value.

If the file contains a SYS_ERR column but no SYS_ERR keyword, Sherpa will report "WARNING: using systematic errors ...", but will not read in the errors correctly.

Workaround:

add a non-zero value to this header keyword:

unix% dmhedit infile=my_file.fits filelist=none op=add key=SYS_ERR value=1.0