===== UL =====
=== MKIII/MKIV Lamp Scanning Routine ===

This routine scans an external lamp to cover the range 290 - 325 nm.  Only slit #1 is used and the NiSO4+UG11 filter (position 242) is used for the full range of the scan.  Note that the UG11 filter (position 50) is used on a MKIII instead.