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SHORT_CHANNEL 

      INTEGER value that indicates that noise level should  be  re-computed  for
    the  short spacing data cube if 0 < SHORT_CHANNEL < Number of channels in UV
    data. The noise level is estimated from differences between  adjacent  chan-
    nels.  This method avoids the bias due to strong lines, but assumes channels
    are uncorrelated. If channels are correlated, SHORT_SD_WEIGHT should be  ad-
    justed accordingly.

      Used for tests only.