Using MRTCAL as a FITS reader can be done with a few commands, e.g.:
MRTCAL> read iram30m-fts-20120128s233-imb.fits /file /subscan 2 ! Load the HDUs for subscan 2 MRTCAL> mdump ! Summary of the file HDUs MRTCAL> mdump antslow ! Details of the AntSlow HDU for the current subscan MRTCAL> mdump antslow longoff ! The LONGOFF table for the current subscan MRTCAL> variable ! Create the related Sic variables, e.g. MRTCAL> examine subs%antslow%table%longoff ! the same as Sic arraySee HELP for details and options about these commands. The procedures in the next subsections are extensively based on this IMB-FITS reader.