DIFF

        [SIC\]DIFF Var1|File1 Var2|File2

    List the differences between two entities. Each entity can be  either  a
    Sic  variable  name  or  a GDF file name (images, cubes, UV tables,...).
    Comparison is made on their headers (if both variables provide a header)
    and/or their data (if both variables provide a data array).

    The  result  of the last comparison (true/false) is saved in the logical
    variable SIC%DIFF.