srclist An OM source list generated by the OM processing chain.
The code expects this file to have a table SRCLIST which contains the columns
RA_CORR, DEC_CORR, filtername_CORR_RATE and filtername_CORR_RATE_ERR.
Typical files to use would be the COMBINED source list with a name like
PooooooooooOMCOMBOBSMLI0000.FIT or the merged source list with name
PooooooooooOMCOMBOBSMER0000.FIT.
where oooooooooo specifies the 10 digit observation ID.
