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Selects whether the long slit unit or the multi-slit and fibre slit unit is in the beam.
Format: SLIT_UNIT <position>
Example: SLIT_UNIT LONG_SLIT
Synonyms: LSLIT ( SLIT_UNIT LONG_SLIT)
MSLIT ( SLIT_UNIT MSLIT_FIBRES)
Comments: Moves, stops or initialises the slit unit, or reprograms the SMDM which controls it. Valid parameters are a position in the range 0 to 1; LONG_SLIT ( 1); MSLIT_FIBRES ( 0; STOP; INIT and REPROGRAM. The last option should only be used in exceptional circumstances.