APPLY DELAY

        [CALIBRATE\]APPLY DELAY [Gain] [/FLAG [Threshold]]

      Apply an PathLength (geometric delay) gain calibration result.  The phases
    are  assumed to scale strictly as the frequency. This mode is in general the
    most appropriate, since most residual phase errors are  due  to  the  atmos-
    pheric pathlength change.

      However,  it  may  produce spurious phase jumps if some instrumental phase
    had remained uncalibrated.