Data taken when the telescope was moving too slowly such that sources are buried in 1/f noise, can be flagged using this parameter. The value is a threshold slew velocity (arcsec/sec) measured in tracking coordinates. Assuming we would like to be able to sample scales of at least 30 arcsec (at least two 15 arcsec beams at 850), and assuming a typical 1/f knee of 1 Hz, the telescope needs to slew at least 30 arcsec/sec to place sources in the signal band above the knee. [30]

SC2CLEAN, MAKEMAP, CALCQU