!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! SDDL Name:	STIS_DISP.SDDL
!
! Purpose:      This SDDL file defines the STIS_DISP relation.
!
! Modification History:
!
!   Date       OPR      Who                       Reason
! --------   -------    ---   -------------------------------------------------
! 06/14/96    29753     Baum   Original implementation
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
!
 
LANGUAGE	SQL

RECORD  STIS_DISP_TYPE
 
!------------------------------------------------------------------------------
!
!   RECORD INFORMATION
!
!------------------------------------------------------------------------------
 
 
DESCRIPTION       "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. "

!------------------------------------------------------------------------------
!
!   FIELD INFORMATION
!
!------------------------------------------------------------------------------

    FIELD  detector
        TYPE            C8
        DESCRIPTION     "STIS/CCD, STIS/MA1, STIS/MA2 are the values of
                         OPUS DGX keyword SS_DTCTR found in qelogsheet.config. "
    END_FIELD
	
    FIELD  grating 
        TYPE            C8
        DESCRIPTION     "G140L,G140M,E140M,E140H,X140M,X140H,G230L,G230M,E230M,
                         E230H,X230M,X230H,G230LB,G230MB,G430M,G750L,or G750M.
                         These are the values from OPUS DGX keyword SS_GRTNG
                         that come from qelogsheet.ap_1. "
    END_FIELD
	
    FIELD  cen_wave 
        TYPE            I4
        DESCRIPTION     "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. "
    END_FIELD
	
    FIELD  valid_date 
        TYPE            C17
        DESCRIPTION     "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. "
    END_FIELD
	
    FIELD  ref_wavelen 
        TYPE            R4
        DESCRIPTION     "Actual wavelength at reference pixel (Angstrom)"

    END_FIELD

    FIELD  disp_angle
        TYPE            R4
        DESCRIPTION     "Degrees from axis1 toward axis2 for dispersion. "

    END_FIELD
	
    FIELD  dispersion
        TYPE            R4
        DESCRIPTION     "Change is wavelength (Angstrom) per pixel. "

    END_FIELD
	
    FIELD  scale
        TYPE            R4
        DESCRIPTION     "Change in sky arcsec along slit per pixel. "

    END_FIELD
 
    FIELD  spec_res
        TYPE            R4
        DESCRIPTION     "Resolving power at central wavelength. "

    END_FIELD
 
    FIELD  min_wave
        TYPE            R4
        DESCRIPTION     "Minimum wavelength in spectrum. "

    END_FIELD
 
    FIELD  max_wave
        TYPE            R4
        DESCRIPTION     "Maximum wavelength in spectrum. "

    END_FIELD
 
END_RECORD
 
 
!------------------------------------------------------------------------------
!
!   RELATION DECLARATION
!
!------------------------------------------------------------------------------
 
 
RELATION  stis_disp
 
    TYPE             STIS_DISP_TYPE
 
    DESCRIPTION      "STIS Dispersion Relation"
 
    SUBSYSTEM_USING  "OPUS"

    INDEX  stis_disp_1
        TYPE         unique, clustered
        FIELDS       detector,grating,cen_wave,valid_date
    END_INDEX

END_RELATION
 
!------------------------------------------------------------------------------
!
!   INSTANCE DECLARATION
!
!------------------------------------------------------------------------------
 
 
INSTANCE  stis_disp
 
    GLOBAL
 
    TYPE        STIS_DISP_TYPE
 
END_INSTANCE