[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.