Flagging Integrations near Change to Observing Setup

Change of observing setup may cause bad integrations. In the SMA observations, occasionally after the source change, bad correlations may be generated in the first integrations before the instrument is correctly settled. If this occurs, SMA users may use Miriad task qvack to flag the bad correlations, e.g.

qvack% inp
  Task:   qvack
  vis      = gc_rx1.lsb.tsys % uv file
  select   =
  interval = 0.5             % time interval for which the
                               data are flagged after a 
                               setup change
  force    =
  options  =
  mode     = source          % a change in the source observed