ADAS Subroutine etred9inv

       FUNCTION ETRED9INV( KTYPE , EIJ   , TR    , B    , C )
C-----------------------------------------------------------------------
C
C  ******************** FORTRAN 77 FUNCTION: ETRED9INV ******************
C
C  PURPOSE:  TO CALCULATE THE ELECTRON ENERGY FROM THE REDUCED ENERGY
C            FOR EIGHT TYPES OF TRANSITION 
C
C  CALLING PROGRAM: ADAS108
C
C  FUNCTION:
C
C  INPUT:    (R*8)    EIJ    =   TRANSITION ENERGY (Eij)
C            (R*8)    TR     =   REDUCED ENERGY
C            (R*8)    B      =   BURGESS SCALING PARAMETER - B
C            (R*8)    C      =   BURGESS SCALING PARAMETER - C
C            (R*8)    TL     =   Ej/Eij
C            (I*4)    KTYPE  =   TRANSITION TYPE
C                                1 ELECTRIC DIPOLE	- EXP THRESHOLD
C                                2 NON ELECTRIC DIPOLE	- EXP THRESHOLD
C                                3 SPIN CHANGE		- EXP THRESHOLD
C                                4 OTHER		- EXP THRESHOLD
C                                5 ELECTRIC DIPOLE	- POWER THRESHOLD
C                                6 NON ELECTRIC DIPOLE	- POWER THRESHOLD
C                                7 SPIN CHANGE		- POWER THRESHOLD
C                                8 OTHER		- POWER THRESHOLD
C
C  OUTPUT:   (R*8)    ETRED9INV=   ELECTRON ENERGY
C
C            (I*4)    IASYMC =   ASYMPTOTIC CLASSIFICATION TYPE
C            (I*4)    ITHRSC =   THRESHOLD CLASSIFICATION TYPE
C            (R*8)    E0     =   SWITCHING ENERGY
C
C 
C  ROUTINES: NONE
C
C  DATE:     25/05/99				VERSION 1.1
C  AUTHOR:   HUGH SUMMERS, UNIVERSITY OF STRATHCLYDE
C
C-----------------------------------------------------------------------
      INTEGER             KTYPE
      REAL*8              B,           C,           EIJ,         TR