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ADAS Subroutine e6data

       SUBROUTINE E6DATA( IUNIT  , NDLEV  , NDTEM , NDTRN ,
     &                    ELEM   , IZ     , IZ0   , IZ1   ,
     &                    IL     ,
     &                    IA     , CSTRGA , ISA   , ILA   , XJA    ,
     &                    NV     ,
     &                    TEA    , DENSA  , PRESA , RNHNE , TMA    ,
     &                    ITRAN  ,
     &                    I1A    , I2A    , APWL  , SWL   , GFT    ,
     &                    LVALID , INDX
     &                  )
C-----------------------------------------------------------------------
C
C  ****************** FORTRAN77 SUBROUTINE: E6DATA *********************
C
C  PURPOSE:  TO FETCH DATA FROM INPUT GFT DATA SET OF TYPE ADF20.
C
C  CALLING PROGRAM: ADAS506
C
C           THE UNITS USED IN THE DATA FILE ARE TAKEN AS FOLLOWS:
C
C           ELECTRON TEMPERATURE: KELVIN
C           ELECTRON DENSITY    : CM-3
C           ELECTRON PRESSURE   : K CM-3
C           TIME                : NOT SPECIFIED
C           WAVELENGTH          : ANGSTROM
C           GFT COEFFT.         : CM3 SEC-1
C
C
C  SUBROUTINE:
C
C  INPUT : (I*4)  IUNIT   = UNIT TO WHICH INPUT FILE IS ALLOCATED
C  INPUT : (I*4)  NDLEV   = MAXIMUM NUMBER OF LEVELS THAT CAN BE READ
C  INPUT : (I*4)  NDTEM   = MAXIMUM NUMBER OF TEMPERATURES
C  INPUT : (I*4)  NDTRN   = MAX. NUMBER OF TRANSITIONS THAT CAN BE READ
C
C  OUTPUT: (C*2)  ELEM    = ELEMENT SYMBOL.
C  OUTPUT: (I*4)  IZ      =  RECOMBINED ION CHARGE READ
C  OUTPUT: (I*4)  IZ0     =         NUCLEAR CHARGE READ
C  OUTPUT: (I*4)  IZ1     = RECOMBINING ION CHARGE READ
C                           (NOTE: IZ1 SHOULD EQUAL IZ+1)
C
C  OUTPUT: (I*4)  IL      = INPUT DATA FILE: NUMBER OF ENERGY LEVELS
C
C  OUTPUT: (I*4)  IA()    = ENERGY LEVEL INDEX NUMBER
C  OUTPUT: (C*18) CSTRGA()= NOMENCLATURE/CONFIGURATION FOR LEVEL 'IA()'
C  OUTPUT: (I*4)  ISA()   = MULTIPLICITY FOR LEVEL 'IA()'
C                           NOTE: (ISA-1)/2 = QUANTUM NUMBER (S)
C  OUTPUT: (I*4)  ILA()   = QUANTUM NUMBER (L) FOR LEVEL 'IA()'
C  OUTPUT: (R*8)  XJA()   = QUANTUM NUMBER (J-VALUE) FOR LEVEL 'IA()'
C                           NOTE: (2*XJA)+1 = STATISTICAL WEIGHT
C
C  OUTPUT: (I*4)  NV      = INPUT DATA FILE: NUMBER OF TEMP/DENS/PRESS/
C                           TIME SETS
C  OUTPUT: (R*8)  TEA()   = INPUT DATA FILE: ELECTRON TEMPERATURES (K)
C  OUTPUT: (R*8)  DENSA() = INPUT DATA FILE: ELECTRON DENSITIES (CM-3)
C  OUTPUT: (R*8)  PRESA() = INPUT DATA FILE: ELECTRON PRESSURES (K CM-3)
C  OUTPUT: (R*8)  TMA()   = INPUT DATA FILE: TIMES OR ARBITRARY (S ?)
C
C  OUTPUT: (I*4)  ITRAN   = INPUT DATA FILE: NUMBER OF TRANSITIONS
C
C  OUTPUT: (I*4)  I1A()   = TRANSITION:
C                            LOWER ENERGY LEVEL INDEX
C  OUTPUT: (I*4)  I2A()   = TRANSITION:
C                            UPPER ENERGY LEVEL INDEX
C  OUTPUT: (R*8)  APWL()  = APPROXIMATE TRANSITION WAVELENGTH (A)
C  OUTPUT: (R*8)  SWL()   = EXACT TRANSITION WAVELENGTH (A)  (IF SET)
C  OUTPUT: (R*8)  GFT(,)  = GFT COEFFICIENT FOR TRANSITION (CM3 S-1)
C                           1ST DIMENSION - TEMPERATURE 'TEA()'
C                           2ND DIMENSION - TRANSITION INDEX
C  OUTPUT: (L*4)  LVALID  = .TRUE. DATA SET READ AND APPEARS VALID
C                         = .FALSE. ERROR DETECTED IN READING DATA SET
C#
C# OUTPUT: (I*4)  INDX()  = TRANSITION INDEX (USED IN DEM CODES)
C
C
C          (I*4)  I4UNIT  = FUNCTION (SEE ROUTINE SECTION BELOW)
C          (I*4)  I4FCTN  = FUNCTION (SEE ROUTINE SECTION BELOW)
C          (I*4)  I4EIZ0  = FUNCTION (SEE ROUTINE SECTION BELOW)
C          (I*4)  I       = GENERAL USE.
C          (I*4)  IABT    = RETURN CODE FROM 'I4FCTN'
C          (I*4)  J       = GENERAL USE.
C          (I*4)  K       = GENERAL USE.
C          (I*4)  NVAL    = GENERAL USE
C          (I*4)  IRECL   = RECORD LENGTH OF INPUT DATASET (<=128)
C
C
C          (C*1)  CSLASH  = '/' - DELIMITER FOR 'XXHKEY'
C          (C*4)  C4      = GENERAL USE FOUR BYTE CHARACTER
C          (C*5)  IONNAM  = EMITTING ION READ FROM DATA SET
C          (C*7)  CKEY1   = 'NLEVELS' - INPUT HEADER KEY
C          (C*6)  CKEY2   = 'NKNOTS'  - INPUT HEADER KEY
C          (C*6)  CKEY3   = 'NLINES'  - INPUT HEADER KEY
C          (C*3)  TITLED  = ELEMENT SYMBOL INCLUDING '+'
C          (C*80) CLINE   = CURRENT ENERGY LEVEL INDEX PARAMETER LINE
C          (C*127)BUFFER  = GENERAL STRING BUFFER STORAGE
C
C
C ROUTINES:
C          ROUTINE    SOURCE    BRIEF DESCRIPTION
C          -------------------------------------------------------------
C          XXWORD     ADAS      EXTRACT POSITION OF NUMBER IN BUFFER
C          I4UNIT     ADAS      FETCH UNIT NUMBER FOR OUTPUT OF MESSAGES
C          R8FCTN     ADAS      CONVERTS FROM CHARACTER TO REAL VARIABLE
C          I4FCTN     ADAS      CONVERTS CHARACTER STRING TO INTEGER
C          I4EIZ0     ADAS      RETURNS Z0 FOR GIVEN ELEMENT SYMBOL
C
C
C ROUTINES: NONE
C
C AUTHOR:  H. P. SUMMERS, JET
C          K1/1/57
C          JET EXT. 4941
C
C DATE:    07/04/94
C
C UPDATE:  APR18-95
C#         A. C. LANZAFAME, DPAP UNIVERSITY OF STRATHCLYDE
C#         TRANSITION INDEX (INDX) ADDED. USED IN DEM CODES
C#         TO IDENTIFY THE TRANSITION
C#
C#         CHARACTER CSTRGA(NDLEV)*(*) changed to CHARACTER*18 CSTRGA(NDLEV)
C#         after experinced unstable behaviour on Sun workstation
C
C UPDATE:
C VERSION:      1.2             DATE:   09-11-95
C MODIFIED: Alessandro Lanzafame
C           - Commented out superfluous variables
C
C
C VERSION: 1.3                          DATE: 06-06-2003
C MODIFIED: Martin O'Mullane
C                   - Warn user that the routine is now deprecated
C                     and that xxdata_20 should be used instead.
C
C-----------------------------------------------------------------------
C-----------------------------------------------------------------------
      CHARACTER*18        CSTRGA(NDLEV)
      CHARACTER*2         ELEM
      INTEGER             I1A(NDTRN),  I2A(NDTRN),  IA(NDLEV),   IL
      INTEGER             ILA(NDLEV),  INDX(NDTRN), ISA(NDLEV),  ITRAN
      INTEGER             IUNIT,       IZ,          IZ0,         IZ1
      INTEGER             NDLEV,       NDTEM,       NDTRN,       NV
      LOGICAL             LVALID
      REAL*8              APWL(NDTRN), DENSA(NDTEM)
      REAL*8              GFT(NDTEM,NDTRN),         PRESA(NDTEM)
      REAL*8              RNHNE(NDTEM),             SWL(NDTRN)
      REAL*8              TEA(NDTEM),  TMA(NDTEM),  XJA(NDLEV)
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