Dave Pooley reports that xselect has problems under Mac OS 10.4 but not 10.3 when using ROSAT data. I confirmed the error under 10.4. The error message is something like
Could not find keyword for Instrument for ROSAT
Got new mission: ?4????AF?'?AF?AF?AF??
I don't know why this occurs but the fix is to edit xselect.mdb to use the new wildcard facility to deal with the PSPCB and PSPCC instrument variant names instead of using the instkey specification to only read the first four characters of the INSTRUME keyword.