Keywords: mrtcal-user-manual

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## Calibration status

When an IMB-FITS file is first indexed, its calibration status is set as `NONE`. For example:

      N.V ProjId    Source         Date          UT     Scn Backe  ObsType    Swi Calibr
      1.1 054-09   CONTROLD     30-SEP-2010  20:52:47.0 200 4MHZ  CALIBRATE   PSW NONE

When it is successfully calibrated, its status is set as `DONE`:

      N.V ProjId    Source         Date          UT     Scn Backe  ObsType    Swi Calibr
      1.2 054-09   CONTROLD     30-SEP-2010  20:52:47.0 200 4MHZ  CALIBRATE   PSW DONE E0HLI:254 E0VLI:198

However, in case of failure during the calibration, the status is set as `FAILED`. It can be useful to find all the failed calibrations for a closer look. This can be achieved with the command:

    MRTCAL> MFIND /CALIBRATION FAILED

It can also happen that an IMB-FITS file has no useful data. The file structure is correct but either it contains no subscan, or no `ON` subscan, or no data dumps within the susbcans. In these cases, the calibration does not fail (from the computing point of view) but there is nothing relevant which can be done from these files: calibration scans can not be used, and science scans produce no spectra. Their calibration status is set as `EMPTY`.

Note that the `PIPELINE` command chooses automatically which calibration scan it pairs with a science scan. In particular, it ignores all the `FAILED` and `EMPTY` calibration scans, which means either it uses a `DONE` calibration scan, or it processes the desired one if not yet done.

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