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Computes delta time (in minutes) from the beginning of the first scan to the end of the last scan in a dataset, either from
the measurement set itself, or from its a ValueMapping structure.
The ValueMapping method assumes that the times and scans are in ascending order.
Usage:
au.computeClockTimeOfMS(vis=None, vm=None)
Example:
CASA <8>: au.computeClockTimeOfMS(vis='uid___A002_X6e23cb_X1628.ms')
Out[8]: 46.944000021616617