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 NONEWhen 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.