ADAS Subroutine a6data

      SUBROUTINE A6DATA( DSFULL , INDXREF , TITLE , CAMETH , Z0    , Z ,
     &                   Z1     , NIGRP   , EMIN  , CIA    , NSHELA,
     &                   EIONA  , IZETAA  , NRGRP , CRA    , NRESOA,
     &                   ENERA  , WGHTA   , ICT   , XA     , YA    ,APA,
     &                   ITOUT  , TOA     , YOA   , YOAP   ,
     &                   ISTDIM , IREAD   , NA    , LA
     &     )
C-----------------------------------------------------------------------
C
C  ********************* FORTRAN77 SUBROUTINE A6DATA *******************
C
C  PURPOSE: TO REFRESH A DATA INDEX FROM AN ADAS106 ARCHIVE. READS
C           IN THE INDEX CODE A-ADAS, B-BURGESS AND THE THE REST OF
C           THE DATA AS APPROPRIATE.
C
C  CALLING PROGRAM: 
C            ADAS106.FOR
C
C  INPUT:
C            (C*80) DSFULL   - THE USERS' CHOSEN ARCHIVE FILE NAME.
C            (I*4)  INDXREF  - THE INDEX NUMBER TO REFRESH FROM.
C            (C*4)  CAMETH   - THE TAG TO DISTINGUISH BETWEEN THE
C                              TWO TYPES OF ANALYSIS.
C                              A - ADAS, B- BURGESS
C            (I*4)  ISTDIM = ARRAY DIMENSIONS : MAX. NO OF VALUES THAT
C                            CAN BE READ IN
C            (I*4)  IREAD  = THE INPUT UNIT
C 
C  OUTPUTS: 
C            (C*40) TITLE    - THE INFORMATION LINE IN THE ARCHIVE
C                              FILE.
C            (R*8)  Z0     = NUCLEAR CHARGE OF ION         
C            (R*8)  Z      = INITIAL ION CHARGE                  
C            (R*8)  Z1     = FINAL ION CHARGE
C            (I*4)  NIGRP  = NO. OF SHELL GROUPS
C            (R*8)  EMIN   = MINIMUM ENERGY (?)
C            (R*8)  CIA()  = SCALING PARAMETERS FOR SHELL GROUPS
C            (I*4)  NSHELA()=NO. OF ENTRIES FOR EACH SHELL GROUP
C            (I*4)  NA(,)  = SHELL GROUP DATA : N
C            (I*4)  LA(,)  = SHELL GROUP DATA : L
C            (R*8)  EIONA(,)=SHELL GROUP DATA : EION(RYD)
C            (I*4)  IZETAA(,)=SHELL GROUP DATA : IZETA
C            (I*4)  NRGRP  = NO. OF RESONANCE GROUPS
C            (R*8)  CRA()  = SCALING PARAMETERS FOR RESONANCE GROUPS
C            (I*4)  NRESOA()=NO. OF ENTRIES FOR EACH RESONANCE GROUP
C            (R*8)  ENERA(,)=RESONANCE GROUP DATA : ENERGY(RYD)
C            (R*8)  WGHTA(,)=RESONANCE GROUP DATA : WEIGHT
C            (R*8)  ICT    = NO. OF ENERGY / X-SECTION PAIRS
C            (R*8)  XA()   = X, THRESHOLD PARAMETER RELATIVE TO FIRST IONIS. POT.
C            (R*8)  YA()   = Q/(1-1/X), Q=CROSS-SECTION ?
C            (R*8)  APA()  = QEM/(1-1/X), QEM=APPROX. X-SECTION )
C            (R*4)  YPA()  = Q/QEM
C            (I*4)  ITOUT  = NO. OF TEMPS.
C            (R*8)  TOA()  = TEMP (KELVIN)
C            (R*8)  YOA()  = S, MAXWELL AVERAGED IONISATION RATE COEFF.(CM^3 S^-1)
C            (R*8)  YOAP() = SEM, APPROXIMATE RATE COEFF.
C
C  ROUTINES: NONE
C
C  AUTHOR:   WILLIAM OSBORN, TESSELLA SUPPORT SERVICES PLC., 28TH AUG 1996
C
C  VERSION 1.1                                           DATE: 28-08-96
C  MODIFIED: WILLIAM OSBORN
C		- FIRST RELEASE
C
C-----------------------------------------------------------------------
      CHARACTER*4         CAMETH
      CHARACTER*80        DSFULL
      CHARACTER*40        TITLE
      INTEGER             ICT,         INDXREF,     IREAD,       ISTDIM
      INTEGER             ITOUT,       IZETAA(6,2), LA(6,2),     NA(6,2)
      INTEGER             NIGRP,       NRESOA(2),   NRGRP
      INTEGER             NSHELA(2)
      REAL*8              APA(ISTDIM), CIA(2),      CRA(2)
      REAL*8              EIONA(6,2),  EMIN,        ENERA(6,2)
      REAL*8              TOA(ISTDIM), WGHTA(6,2),  XA(ISTDIM)
      REAL*8              YA(ISTDIM),  YOA(ISTDIM), YOAP(ISTDIM)
      REAL*8              Z,           Z0,          Z1