Description
The GBT Antenna FITS file contains information on the telescope focus parameters.
The focus information is normally sampled 10 times a second. The filler
computes the mean focus parameters over each integration and stores that value
in the NRAO_GBT_MEAN_FOCUS subtable (future versions of the filler will likely
associate this information more closely with the FEED subtable). When the
fillrawfocus
flag is F(alse) (the default value) the raw, unaveraged, focus values are not saved
in the MeasurementSet in order to save space. This behavior can be changed by
setting this flag to T. When this flag is true, the raw focus values can be
found in the NRAO_GBT_FOCUS subtable. This decision must be made before the
MeasurementSet is filled.
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2006-08-01