ADAS Subroutine ouredinv

       FUNCTION OUREDINV( IXTYP , EIJ   , EJ  , DGEY  , C )
C-----------------------------------------------------------------------
C
C  ******************** FORTRAN 77 FUNCTION: ETREDINV ******************
C
C  PURPOSE:  TO CALCULATE THE COLLISION STRENGTH FROM THE REDUCED 
C            COLLISION STRENGTH FOR FOUR TYPES OF TRANSITION 
C
C  CALLING PROGRAM:
C
C  FUNCTION:
C
C  INPUT:    (R*8)    EIJ    =   TRANSITION ENERGY (Eij)
C            (R*8)    EJ     =   COLLIDING ELECTRON ENERGY AFTER 
C                                EXCITATION (Ej)
C            (R*8)    C      =   ADJUSTABLE SCALING PARAMETER
C            (R*8)    ETR    =   Ej/Eij
C            (I)      IXTYPE =   TRANSITION TYPE
C                                1 ELECTRIC DIPOLE
C                                2 NON ELECTRIC DIPOLE
C                                3 SPIN CHANGE
C                                4 OTHER
C            (R*8)    DGEY   =   REDUCED COLLISION STRENGTH
C
C  OUTPUT:   (R*8)    OUREDINV=   ELECTRON ENERGY
C
C 
C  ROUTINES: NONE
C
C  DATE:     22/06/95			VERSION 1.1
C  AUTHOR:   DAVID.H.BROOKS (UNIV. OF STRATHCLYDE)
C
C
C-----------------------------------------------------------------------
      INTEGER             IXTYP
      REAL*8              C,           DGEY,        EIJ,         EJ