Instrument setup

The use of the Camera, Grating unit, Central wavelength, Flexure Compensation and Filter fields is obvious, see the manual for further details. If a filter is "clear" it will be ignored in the script.

The mask drop-down menus or the input field for your own mask are available as soon as you choose "mask in fpu" or "mask in turn out" as Mask position. This is a security issue: If you forget to turn the mask in the light path, you should not be able to choose between the masks.