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ADAS Subroutine e1chkb

      SUBROUTINE E1CHKB( IUNIT  , NBSEL  , IBSEL  ,
     &                   IZ0IN  , IZIN   ,
     &                   IZ0    , IZ     ,
     &                   LOPEN  , IRCODE
     &                 )
C-----------------------------------------------------------------------
C
C  ****************** FORTRAN77 SUBROUTINE: E1CHKB *********************
C
C  PURPOSE: TO CHECK THE SELECTED BLOCK (IBSEL) OF DATA  EXISTS  IN  THE
C           INPUT DATA SET.
C
C           IF SO IT REPRESENTS THE ENTERED VALUES OF
C           'IZ0IN' (NUCLEAR CHARGE OF EMITTING ION)          &
C           'IZIN'  (CHARGE OF EMITTING ION)
C
C           IT ALSO CLOSES THE INPUT DATA SET ALLOCATION IF OPEN.
C
C  CALLING PROGRAM: SSXB
C
C  SUBROUTINE:
C
C  INPUT : (I*4)   IUNIT   = UNIT TO WHICH INPUT DATA SET IS ALLOCATED
C  INPUT : (I*4)   NBSEL   = TOTAL NUMBER OF DATA-BLOCKS READ FROM INPUT
C                            DATA SET.
C  INPUT : (I*4)   IBSEL   = INDEX OF DATA-BLOCK SELECTED FOR ANALYSIS
C
C  INPUT : (I*4)   IZ0IN   = REQUESTED: NUCLEAR CHARGE OF EMITTING ION
C  INPUT : (I*4)   IZIN    = REQUESTED: CHARGE OF EMITTING ION
C
C  INPUT : (I*4)   IZ0     = INPUT FILE: NUCLEAR CHARGE OF EMITTING ION
C  INPUT : (I*4)   IZ      = INPUT FILE: CHARGE OF EMITTING ION
C
C  I/O   : (L*4)   LOPEN   = INPUT : .TRUE.  => INPUT DATA SET OPEN.
C                                    .FALSE. => INPUT DATA SET CLOSED.
C                            OUTPUT: ALWAYS RETURNED AS .FALSE.
C  OUTPUT: (I*4)   IRCODE  = RETURN CODE FROM SUBROUTINE:
C                            0 => NO ERROR DETECTED.
C                            2 => DISCREPANCY BETWEEN REQUESTED CHARGES
C                                 AND THOSE IN INPUT DATA FILE.
C                            3 => SELECTED DATA-BLOCK  OUT OF RANGE  OR
C                                 DOES NOT EXIST.
C
C          (I*4)   I4UNIT  = FUNCTION (SEE ROUTINE SECTION BELOW)
C
CA         (c*80)  DSNAME  = NAME OF DATA FILE INCLUDING PATH.
C
C ROUTINES:
C          ROUTINE    SOURCE    BRIEF DESCRIPTION
C          ------------------------------------------------------------
C          E1FILE     ADAS      OPEN DATA SET FOR SELECTED EMITTER
C          I4UNIT     ADAS      FETCH UNIT NUMBER FOR OUTPUT OF MESSAGES
C
C AUTHOR:  PAUL E. BRIDEN (TESSELLA SUPPORT SERVICES PLC)
C          K1/0/37
C          JET EXT. 2520
C
C DATE:    03/05/91
C
C UPDATE:  23/04/93 - PE BRIDEN - ADAS91: ADDED I4UNIT FUNCTION TO WRITE
C                                         STATEMENTS FOR SCREEN MESSAGES
C
C UPDATE:  24/05/93 - PE BRIDEN - ADAS91: CHANGED I4UNIT(0)-> I4UNIT(-1)
C UPDATE:  31/10/94 - LALIT JALOTA - INCREASED SIZE DSNAME TO *80 FOR
C			UNIX.
C
C-----------------------------------------------------------------------
C
C VERSION: 1.1				DATE: 02-05-95
C MODIFIED: UNKNOWN (SOMEONE FROM TESSELLA SUPPORT SERVICES PLC)
C	    - PUT UNDER SCCS CONTROL
C
C VERSION: 1.2				DATE: 20-07-07
C MODIFIED: Allan Whiteford
C	    - Small modification to comments to allow for automatic
C             documentation preparation.
C
C-----------------------------------------------------------------------
C
C-----------------------------------------------------------------------
      INTEGER             IBSEL,       IRCODE,      IUNIT,       IZ
      INTEGER             IZ0,         IZ0IN,       IZIN,        NBSEL
      LOGICAL             LOPEN
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