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Opens or closes the UES slit shutter
Format: USLITSHUT <parameter>
Units: None
Range: 0, 1, OPEN, CLOSE
Defaults: Defaults to uninitialised on power--up
Examples : USLITSHUT 0
Comments: This command is only provided for test purposes. During normal operation the shutter is controlled by the detector. This command may be useful for closing the shutter if it does not close properly at the end of an exposure.