READ /PLANES

        [CLEAN\]READ Buffer File /PLANES Min Max

    Read only the last axis "planes" between the  First and Last implied by  Min
    and Max. For an LMV-ordered cube, this would be equivalent to
          READ Buffer File /RANGE Min Max CHANNEL
    However,  for transposed data cubes, VML or LVM-ordered for example, this is
    not true at all when a Frequency/Velocity  axis  is  present:  /RANGE  would
    specify  a  subset of this(yet) axis, while /PLANES always indicate a subset
    of the 3rd axis of the cube.

    Min and Max indicate offsets from Plane 1 and the number of  planes  Nplane.
    Thus  Max  can be negative: it then indicates Last = Nplane-Max.  Also Min=0
    and Max=0 implies loading all the channels.