!--------------------------------------------------------------------------------------------------
!  DOXYGEN
!> @brief MODULE OPTIONS CONTAINS USER OPTIONS
!! @details MODULE OPTIONS CONTAINS USER OPTIONS
!! SPVAL : FLAG FOR MISSING DATA ON OUTPUT GRID. THIS CAN ARISE IF OUTPUT GRID EXTENDS BEYOND THE 
!!         FILLED E-GRID.
!!
!! IBESSL: SWITCH FOR TYPE OF HORIZONTAL INTERPOLATION FROM FILLED E-GRID TO OUTPUT GRID.
!!         -1 =  4 - POINT LINEAR INTERPOLATION SCHEME WITH GRADIENT CORRECTION. THIS OPTION IS NOT 
!!         AVAILABLE
!!          0 =  4 - POINT LINEAR INTERPOLATION SCHEME
!!          1 = 16 - POINT BESSEL INTERPOLATION SCHEME. THIS OPTION IS NOT AVAILABLE.
!!
!! KSB   : SQUARE ROOT OF THE NUMBER OF SUB-BOXES WHICH SUBROUTINE CETLIH USES. SUBROUTINE CETLIH 
!!         INTERPOLATES A H-POINT ETA GRID FIELD TO AN OUTPUT GRID CONSERVING THE AREA INTEGRAL OF 
!!         THE E-GRID FIELD.  
!!         WHEN INTERPOLATING PRECIP AMOUNT TO A COARSER RESOLUTION GRID, KSB = 3 IS A GOOD CHOICE.  
!!         IF INTERPOLATING TO A FINER RESOLUTION GRID, KSB = 8 IS A GOOD CHOICE.
!!
!! IOFFS : PLUS/MINUS NUMBER OF POINTS ABOUT SOUTHWEST CORNER OUTPUT GRID POINT OVER WHICH CETLIH4.F
!!         SEARCHES THE CLOSEST OUTPUT GRID POINT TO EACH SUB-BOX. WHEN INTERPOLATING TO A COARSER 
!!         RESOLUTION GRID, IOFFS=2 OR 3 IS A GOOD CHOICE.
!!         IF INTERPOLATING TO A FINER RESOLUTION GRID, IOFFS = 5 OR 6 IS A GOOD CHOICE.
!!
!! IFLAG : CONTROLS OUTPUT FROM FILLV
!!     IFLAG = 0 -> TAKE WHAT INTERPOLATION GIVES
!!     IFLAG = 1 -> TRUNCATE OUTPUT AT ZERO
!!     IFLAG = 2 -> TRUNCATE AT A VERY SMALL
!!
!! POSITIVE NUMBER (EPS)
!!
!! SATDEL: FRACTIONAL VARIATION OF SATURATION. SUBROUTINE NLYLI (N-LAYER LIFTED INDEX) LIFTS A 
!!         MODIFIED PARCEL.
!!         PARCEL SPECIFIC HUMIDITY IS MODIFIED ACCORDING TO THE FORMULA QMOD = (1+SATDEL) * QGIVEN.
!!         THE NGM USES SATDEL = 0.05
!! @author Lucci 
!! @date 18-03-20 \n
!<
!> @details <b>Use Module:</b>   
!! @arg @c F77KINDS
!! @details <b>Driver:</b> 
!! @arg @c SURFCE
!<
!--------------------------------------------------------------------------------------------------
    MODULE OPTIONS
!--------------------------------------------------------------------------------------------------
! MODULE OPTIONS
!
! ABSTRACT:
! MODULE OPTIONS CONTAINS USER OPTIONS
! SPVAL : FLAG FOR MISSING DATA ON OUTPUT GRID. THIS CAN ARISE IF OUTPUT GRID EXTENDS BEYOND THE 
!         FILLED E-GRID.
!
! IBESSL: SWITCH FOR TYPE OF HORIZONTAL INTERPOLATION FROM FILLED E-GRID TO OUTPUT GRID.
!         -1 = 4-POINT LINEAR INTERPOLATION SCHEME WITH GRADIENT CORRECTION. THIS OPTION IS NOT 
!         AVAILABLE
!         0 =  4-POINT LINEAR INTERPOLATION SCHEME
!         1 = 16-POINT BESSEL INTERPOLATION SCHEME. THIS OPTION IS NOT AVAILABLE.
!
! KSB   : SQUARE ROOT OF THE NUMBER OF SUB-BOXES WHICH SUBROUTINE CETLIH USES. SUBROUTINE CETLIH 
!         INTERPOLATES A H-POINT ETA GRID FIELD TO AN OUTPUT GRID CONSERVING THE AREA INTEGRAL OF 
!         THE E-GRID FIELD.  
!         WHEN INTERPOLATING PRECIP AMOUNT TO A COARSER RESOLUTION GRID, KSB = 3 IS A GOOD CHOICE.  
!         IF INTERPOLATING TO A FINER RESOLUTION GRID, KSB = 8 IS A GOOD CHOICE.
!
! IOFFS : PLUS/MINUS NUMBER OF POINTS ABOUT SOUTHWEST CORNER OUTPUT GRID POINT OVER WHICH CETLIH4.F
!	   SEARCHES THE CLOSEST OUTPUT GRID POINT TO EACH SUB-BOX. WHEN INTERPOLATING TO A COARSER 
!         RESOLUTION GRID, IOFFS=2 OR 3 IS A GOOD CHOICE.
!         IF INTERPOLATING TO A FINER RESOLUTION GRID, IOFFS = 5 OR 6 IS A GOOD CHOICE.
!
! IFLAG : CONTROLS OUTPUT FROM FILLV
!	   IFLAG = 0 -> TAKE WHAT INTERPOLATION GIVES
!	   IFLAG = 1 -> TRUNCATE OUTPUT AT ZERO
!	   IFLAG = 2 -> TRUNCATE AT A VERY SMALL
!
! POSITIVE NUMBER (EPS)
!
! SATDEL: FRACTIONAL VARIATION OF SATURATION. SUBROUTINE NLYLI (N-LAYER LIFTED INDEX) LIFTS A 
!         MODIFIED PARCEL.
!         PARCEL SPECIFIC HUMIDITY IS MODIFIED ACCORDING TO THE FORMULA QMOD = (1+SATDEL) * QGIVEN.
!         THE NGM USES SATDEL = 0.05
!
! USE MODULES: F77KINDS
!
! DRIVER     : SURFCE
!--------------------------------------------------------------------------------------------------
    USE F77KINDS
!
    IMPLICIT NONE
!
    INTEGER(KIND=I4)                                                                            ::&
    & SPVAL   , IBESSL  , KSB     , IOFFS   , IFLAG   
!
    REAL   (KIND=R4)                                                                            ::&
    & SATDEL
!
    DATA SPVAL  / 99999      /
    DATA IBESSL /     0      /
    DATA KSB    /     3      /
    DATA IOFFS  /     2      /
    DATA IFLAG  /     0      /
    DATA SATDEL /     0.05   /
!
    END MODULE OPTIONS