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Controls the Blue grating.
Format: BLUEGRAT <angle>
Example: BLUEGRAT 48912
Synonym: BGRAT
Units: Millidegrees.
Range: 0 to 110000.
Comments: Moves, stops or initialises the Blue Grating, or reprograms the SMDM which controls it. Valid parameters are an angle in millidegrees; STOP; INIT and REPROGRAM. The last option should only be used in exceptional circumstances.