1 EXTREMA Compute and store the extrema of a GDF‐like file
        EXTREMA

    A  simple  minded routine to compute and store the extrema of a GDF‐like
    file into its header.  It is functionnally  equivalent  to  the  command
    "HEADER File /EXTREMA" in the GRAPHIC program.

2 FILE$
        TASK\FILE "Input file name" FILE$

    The input file name
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