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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.