07/03/03 48821 CTB Converted to XML format "This relation is used to define the values OPUS needs for WCS calculations for observations using dispersive elements. There must be a record in this table for every STIS spectral element (except MIRROR and PRISM) and valid central wavelength (as listed in the proposal instructions). If significant MSM changes are made during the mission that requires different data for different observation times, the valid_date is used by OPUS to fetch the right record. " C8 "STIS/CCD, STIS/MA1, STIS/MA2 are the values of OPUS DGX keyword SS_DTCTR found in qelogsheet.config. " C8 "G140L,G140M,E140M,E140H,X140M,X140H,G230L,G230M,E230M, E230H,X230M,X230H,G230LB,G230MB,G430M,G750L,or G750M. The mirror and prism values are also allowed: MIRVIS,MIRCUV,MIRFUV,MIRNUV or PRISM. These are the values from OPUS DGX keyword SS_GRTNG that come from qelogsheet.ap_1. " I4 "The central wavelength supplied in the proposal and found in OPUS DGX keyword SS_CWAVE that comes from qelogsheet.min_wave. The allow values are in the proposal instructions. For mirror elements the value can be zero. " I2 "This number indicates which set of MAMA dither offsets are being used. The value 0 is the baseline MSM positions (not dithered). " C17 "YYYY.DDD:HH:MM:SS, the date-time of either the SMS which loads a new dither table or a time preceding the first STIS observation that uses a new dither table. " I2 "This number indicates the motor step position for cylinder 1 used for this dither position. " I2 "This number indicates the MSM motor step position for cylinder 3 used for this dither position. " I2 "This number indicates the MSM motor step position for cylinder 4 used for this dither position. " R4 "Axis 1 pixel offset for this MSM position. " R4 "Axis 2 pixel offset for this MSM position. " STIS_MSM_TYPE STIS Mode Select Mechanism Relation OPUS unique clustered