CANCEL

                  OBS\CANCEL [CANCEL|KILL|STOP]

         The command CANCEL interrupts the data acquisition process.

            OBS\CANCEL

    Cancels current scan loop.  Data acquisition is stopped at  end  of  the
    next   subscan.   A  CANCEL  is  implicitely done by C in multi subscans
    procedures, such as FOCUS, POINTING and SKYDIP.

            OBS\CANCEL KILL

    Aborts current scan.  Data acquisition is stopped as  soon  as  possible
    (depending on observing procedure) and the data are flagged "Deleted" in
    the output file.  CANCEL KILL may be used  after  C  has  been   pressed
    during  a multi subscans command (FOCUS, POINTING, or SKYDIP).  A CANCEL
    KILL is implicitely done by a command MICRO.

            OBS\CANCEL STOP

    Requests reduction programs (RDI and AFF) to stop.

            OBS\CANCEL WAIT

    Allows OBS to proceed when it would normally  say  ``Waiting  for  ...''
    This command has to be used only when something abnormal happened in the
    acquisition (e.g. RDI crash).