DRIFT

                  OBS\DRIFT    [Length    Speed    Angle      [Integration]]
    [/HORIZON] [/BASIS]

         Define a continuum drift single-dish procedure.
    - Length is the length of the drift in current angle units.
    - Speed is the drift speed ins arcseconds per second of time.
    - Angle is the orientation angle of the drift in degrees, and the option
    /HORIZON  or  /BASIS  indicates  whether this angle is in the Horizontal
    coordinate system or in the current Basis coordinate  system.   Standard
    orientation angles are
       +AZ   -90 degrees
       -AZ   +90 degrees
       +EL     0 degrees
       -EL   180 degrees
    - Integration is the integration time for each  dump  of  the  continuum
    detectors in seconds.