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Sets the UES slit length, by moving the dekker.
Format: USLITLEN <parameter> <units>
Units: ARCSEC, MM, PIX
Defaults: Defaults to uninitialised on power--up
Examples : USLITLEN 5 ARCSEC, USLITLEN 20 MM
Comments: The slitlength can be specified in mm
at the slit, arcsec on the sky, or projected
pixels on the detector. In order to calculate
the slitlength in pixels, the pixelsize must have
been specified using the PIXSIZE command.
USLITLEN AUTO automatically determines
appropriate slitlength according to echelle and
central wavelength combination in use.