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RANDOM_MAP /BLANKING 

        [GREG2\]RANDOM_MAP /BLANKING Bval

    Specify the value Bval to be attributed for  pixels  lying  outside  the
    convex  hull  of triangles. The default value is that defined in the SET
    BLANKING command. This switch is mandatory if no default blanking  value
    is preset and no extrapolation required.