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Last modified: 24 October 2023

URL: https://cxc.cfa.harvard.edu/ciao/bugs/dmgroup.html
/ ciao4.16 / bugs / dmgroup.html

Bugs: dmgroup

For detailed information and examples of running this tool, refer to the dmgroup ahelp file.

Caveats

Minimum and maximum values for the binspec parameter

If there is no min/max given in the binspec parameter, the tool returns the min/max for the datatype for the specified column. If this is a large range, it will fail with 

# dmgroup (CIAO): dsALLOCERR -- ERROR: Could not allocate memory.

Workarounds:

  1. Provide a binning specification in the binspec parameter.

  2. If the column range is missing or too large, one may be forced by filtering the column. For example, to establish a PHA range: 

    unix% pset dmgroup infile="acis_evt2.fits[pha=1:4096]"
/ ciao4.16 / bugs / dmgroup.html