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To move filter slide A in the Red beam to a given position.
Format: RFILTA <position>
Example: RFILTA 2
Range: 0 to 2, or a named position.
Comments: Moves, stops or initialises Red Filter A. Valid parameters are a position in the range 0 to 2; a named filter (listed on the ISIS MIMIC page); OUT; STOP; INIT and REPROGRAM. The last option should only be used in exceptional circumstances.