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The Mission Database File
Starting with Xselect v2.0 much of the mission-dependence has been incorporated into a simple ascii file called xselect.mdb. The default location for this file as distributed with the HEASOFT software is $HEADAS/../ftools/xselect/common/xselect.mdb, i.e.
>ls $HEADAS/../ftools/xselect/common/xselect.mdb /software/heasoft/headas/setup/../ftools/xselect/common/xselect.mdbwhere
$HEADAS is the environment variable which points to your HEASOFT software installation (as described in the HEASOFT installation instructions).
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