MSDP
Parameters

FITS header parameters

     MSDPBMS    Number of channels for each window
     WAVELNTH    Wavelength
     GRORDER    Grating order
     FSLTH     Fielsd Stop length in milliarcsec
     FSWTH    Field Stop width in milliarcsec
     STEP_X     Step length milliarcsec, perpendicular to Field Stop
     NBSET_X    Number of steps
     STEPGRID Step length milliarcsec, parallel to Field Stop
     NBSTGRID    Number of steps
     GRID_MAX    Number of useful grid slits
     BURST     Burst mode
     GRID_PER      Grid period milliarcsec
     GRID_WID    Grid step in milliarcsec
     SEQ_STOK    Number of Stokes parameters

Relation betewen MSDP parameters and FITS parameters

File obs.par
    MSDP parameter        MSDPBMS le 12            MSDPBMS gt 12
        NM                            9                                    8
        NWINP                       1                                      2
        WIN                             1                                      2
        INTERC                    25                                   15
        INVERN                    0                                     1
        INVERL                     0                                     0
        INVERJ                     1                                     1
        MUPRIS                     9000                              3300
        MUSTEP                    1200                              800
        NBCLN                       NAXIS1                         1024
        NBLGN                       NAXIS2                          900

        LBDA            WAVELENTH * WUNIT
        BURST          BURST
        MILALP        1000       or     500    if LBDA eq 6563 and MSDPBMS le 12
        DLBD                      if MSDPBMS and   LBDA   and    GRORDER
                              66         16                          4861                16
                              80         16                          5876                38
                              80         16                          5890                38
                              80         16                          5896                38
                              90         16                          6563                34
                              234        9                           6563                35
                             120        16                          8542                26
        KDECAL       0        for WIN eq 0
                             50                         1

        JYPAS         ABS(STEP_X)
        NTMAX      NBSTEP_X * NBSTGRID
        LI                FSLTH
        LJ               FSWTH
        IX1             1500
        IX2             FSLTH - IX1
        LY             JYPAS + 2000
        JY1            (FSWTH - LY) / 2
        JY2            JY1 + LY
        MGRIM     GRID_MAX

                                        GRID_MAX eq 0          GRID_MAX ne 0
        IWGRI                     0                                    GRI_WID
        NQUV                     0                                    SEQ_STOK
        MINPRO                 500                                0

                                        STEPGRID gt 0             STEPGRID le 0
        INVERI                    1                                    0
        INVI                        0                                    1

File exe.par

MSDP parameter MSDPBMS le 12 MSDPBMS gt 12
MILSEC 200 150

                                        GRID_MAX eq 0          GRID_MAX ne 0
        ITGRI                       0                                   GRID_PER
        IGRI                        34000                            GRID_WID -2000
        IDEB                        9500             (LI-GRID_MAX*GRID_PER)/2 - IX1 + (GRID_WID-IGRI)/2

                                                        LBDA
        ITANA            17600                4861
                                17100                5876
                                17100                5890
                                17100                5896
                                16900                6563
                                16600                8542

                                        MSDPBMS eq 16        MSDPBMS eq 9         else
        LMP3                         2                                 2                                  -1
        LBDL3                     6                                 4                                  -1
        LBPASR3                 6                                 4                                 -1

LBD1D3 8 4 4


                                       
				    MSDPBMS eq 9       MSDPBMS eq 16 
			centerr  lmpr lbdlr lbpasr  lmpr lbdlr lbpasr 
   Profiles		1         2    4    4       2    6    6
				  0    0    0       0    0    0	
				  0    0    0       0    0    0 
Interpolated profiles   1         4    2    2       7    2    2
				  0    0    0       0    0    0
				  0    0    0       0    0    0 
  Bissector		0         0    0    0       0    0    0
				  0    0    0       0    0    0
				  2    4    4       2    6    6