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Mask parameters

These consist of some of the defaults used in mask design, and also the field scale at the mask focal plane.

• SCALE: the image scale at the focal plane of the telescope, ie. at the mask (arcsec/mm) (The scale at the detector is given by SCALE FRED)
• MAXSLITLEN: the maximum allowed length of mask slit on the sky (arcsec)
• MINYMARGIN: the minimum allowed distance between the object and the ends of the slit (arcsec)
• MINYSEP: the minimum allowed separation between two slits (arcsec)
• FIDUCDIAM: default diameter of fiducial holes (arcsec)