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Sets a grating to give a specified central wavelength on the detector.
Format: CENWAVE <gratingname> <wavelength>
Example: CENWAVE RED 6563
Units: wavelength is specified in Ångstroms.
Comments: A procedure to work out the grating angle required to give a given central wavelength on the detector, and then to set the grating angle to that wavelength. The grating name, which must be RED or BLUE, and the required central wavelength in Ångstroms are specified on the command line. The grove spacing on the grating must be correct in the database, this can be checked on the mimic screen.