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        MAP\XY_MAP [Filename] /TYPE LMV|VLM

    By  default,  XY_MAP produces an LMV cube. This can be overridden by the
    option /TYPE to reorder the dimensions as VLM.

    VLM is the natural ordering of the  XY_MAP  internal  buffers,  i.e.  it
    should  be  faster  to create the cube in this order. VLM cubes are also
    useful when data has to be accessed by spectrum (e.g. to  use  the  cube
    with  FILE  IN  mycube.vlm), as opposed to the LMV cubes which are effi-
    cient for access by channel/plane.

Gildas manager 2020-09-27