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SET SYSTEM 

        [GREG1\]SET SYSTEM Name [Epoch]

    Specify the coordinate system used in case of projection. The  name  can
    be  UNKNOWN, GALACTIC or EQUATORIAL (default epoch is 2000.0 if not pro-
    vided). The SYSTEM affects the projection definitions (in particular the
    GRID command) and coordinates sent back by the cursor (different formats
    are used for each system).

Gildas manager 2014-07-01