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SPAN 

          REAL SPAN[2]

    SPAN  indicates  the limits of plot along the velocity axis, when one of the
    plotted dimensions is Velocity. In particular, SPAN is  used  for  SHOW  PV.
    The  spatial  dimension (if any is displayed) is controlled by SIZE and CEN-
    TER.

    Note that SPAN differs from RANGE: RANGE controls the range of  planes  dis-
    played for a 3-D cube.