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GDFOC(POS) - Change the autoguider focus position

This command is used to change the focus of the Prime Focus autoguider. It should only be necessary to do this at the beginning of a night's observing; if SETGDFOCUS is run (section 3.1.9), the focus will be adjusted automatically to compensate for changes in telescope focus in response to changes of filter thickness.

Argument: required focus in mm (the range is 3.3mm).