HEADER

        [VECTOR\]HEADER     GildasFile|FITSFile|HeaderVariable    [/EXTREMA]
    [/TELESCOPE Args]

    Interact with file headers or header variables. Some actions are  possi-
    ble or not depending on the header kind or properties.

    If no option is present, display the named header.

    The  /EXTREMA  option  computes  (or recomputes) and updates the extrema
    section in the header.

    The /TELESCOPE option creates or  updates  the  telescope  section.  See
    subtopic for details.