Keywords: mrtcal-user-manual

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## FITS reader

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 array

See `HELP` for details and options about these commands. The procedures in the next subsections are extensively based on this IMB-FITS reader.