| 1 | SUBROUTINE SINGLE( E,KIND,AMASS,ASMASS )
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| 2 |
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| 3 | C-----------------------------------------------------------------------
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| 4 | C SINGLE (PARTICLE)
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| 5 | C
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| 6 | C NUCLEON, ANTINUCLEON, PION OR KAON INITIATED
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| 7 | C HANDLES SINGLE PARTICLE CASE
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| 8 | C THIS SUBROUTINE IS CALLED FROM MANY BOX ROUTINES
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| 9 | C ARGUMENTS:
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| 10 | C E = AVAILABLE ENERGY IN CM
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| 11 | C KIND = 1 BACKWARD PARTICLE
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| 12 | C = 0 FORWARD PARTICLE
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| 13 | C AMASS = MASS OF SINGLE PARTICLE
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| 14 | C ASMASS = MASS TO BE LEFT OVER FOR OTHER PARTICLES
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| 15 | C-----------------------------------------------------------------------
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| 16 |
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| 17 | IMPLICIT DOUBLE PRECISION (A-H,O-Z)
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| 18 | *KEEP,CONST.
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| 19 | COMMON /CONST/ PI,PI2,OB3,TB3,ENEPER
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| 20 | DOUBLE PRECISION PI,PI2,OB3,TB3,ENEPER
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| 21 | *KEEP,ELASTY.
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| 22 | COMMON /ELASTY/ ELAST,IELIS,IELHM,IELNU,IELPI
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| 23 | DOUBLE PRECISION ELAST
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| 24 | INTEGER IELIS(20),IELHM(20),IELNU(20),IELPI(20)
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| 25 | *KEEP,PAM.
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| 26 | COMMON /PAM/ PAMA,SIGNUM
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| 27 | DOUBLE PRECISION PAMA(6000),SIGNUM(6000)
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| 28 | *KEEP,PARPAR.
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| 29 | COMMON /PARPAR/ CURPAR,SECPAR,PRMPAR,OUTPAR,C,
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| 30 | * E00,E00PN,PTOT0,PTOT0N,THICKH,ITYPE,LEVL
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| 31 | DOUBLE PRECISION CURPAR(14),SECPAR(14),PRMPAR(14),OUTPAR(14),
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| 32 | * C(50),E00,E00PN,PTOT0,PTOT0N,THICKH
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| 33 | INTEGER ITYPE,LEVL
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| 34 | *KEEP,PARPAE.
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| 35 | DOUBLE PRECISION GAMMA,COSTHE,PHI,H,T,X,Y,CHI,BETA,GCM,ECM
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| 36 | EQUIVALENCE (CURPAR(2),GAMMA), (CURPAR(3),COSTHE),
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| 37 | * (CURPAR(4), PHI ), (CURPAR(5), H ),
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| 38 | * (CURPAR(6), T ), (CURPAR(7), X ),
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| 39 | * (CURPAR(8), Y ), (CURPAR(9), CHI ),
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| 40 | * (CURPAR(10),BETA), (CURPAR(11),GCM ),
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| 41 | * (CURPAR(12),ECM )
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| 42 | *KEEP,RANDPA.
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| 43 | COMMON /RANDPA/ FAC,U1,U2,RD,NSEQ,ISEED,KNOR
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| 44 | DOUBLE PRECISION FAC,U1,U2
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| 45 | REAL RD(3000)
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| 46 | INTEGER ISEED(103,10),NSEQ
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| 47 | LOGICAL KNOR
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| 48 | *KEEP,RUNPAR.
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| 49 | COMMON /RUNPAR/ FIXHEI,THICK0,HILOECM,HILOELB,
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| 50 | * STEPFC,NRRUN,NSHOW,PATAPE,MONIIN,
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| 51 | * MONIOU,MDEBUG,NUCNUC,
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| 52 | * CETAPE,
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| 53 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 54 | * N1STTR,MDBASE,
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| 55 | * DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 56 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 57 | * ,GHEISH,GHESIG
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| 58 | COMMON /RUNPAC/ DSN,HOST,USER
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| 59 | DOUBLE PRECISION FIXHEI,THICK0,HILOECM,HILOELB
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| 60 | REAL STEPFC
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| 61 | INTEGER NRRUN,NSHOW,PATAPE,MONIIN,MONIOU,MDEBUG,NUCNUC,
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| 62 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 63 | * N1STTR,MDBASE
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| 64 | INTEGER CETAPE
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| 65 | CHARACTER*79 DSN
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| 66 | CHARACTER*20 HOST,USER
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| 67 |
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| 68 | LOGICAL DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 69 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 70 | * ,GHEISH,GHESIG
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| 71 | *KEEP,VKIN.
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| 72 | COMMON /VKIN/ BETACM
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| 73 | DOUBLE PRECISION BETACM
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| 74 | *KEND.
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| 75 |
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| 76 | C-----------------------------------------------------------------------
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| 77 |
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| 78 | IF ( DEBUG ) WRITE(MDEBUG,201)E,KIND,AMASS,ASMASS
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| 79 | 201 FORMAT(' SINGLE: E,KIND,AMASS,ASMASS=',1P,E10.4,I3,2E10.4)
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| 80 |
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| 81 | IF ( KIND .NE. 0 ) GOTO 100
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| 82 |
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| 83 | C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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| 84 | C FORWARD PARTICLE
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| 85 | C NUCLEON, ANTINUCLEON, PION, OR KAON
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| 86 | C PIONS AND / OR KAONS ARE ALWAYS FORWARD
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| 87 |
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| 88 | GFCM = ( E**2 + AMASS**2 - ASMASS**2 ) * 0.5D0 / (E*AMASS)
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| 89 | GFCM = MAX( 1.D0, GFCM )
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| 90 | BEFCM = SQRT( GFCM**2 - 1.D0 ) / GFCM
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| 91 | GFLAB = GCM * GFCM * ( 1.D0 + BETACM * BEFCM )
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| 92 | PT = PTRANS(DUMMY)
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| 93 | PLLAB2 = MAX( 1.D-6, AMASS**2*(GFLAB**2-1.D0) )
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| 94 | CTHETA = SQRT( PLLAB2 / (PT**2+PLLAB2) )
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| 95 | IF ( CTHETA .LT. C(27) ) GOTO 3
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| 96 | CALL RMMAR( RD,2,1 )
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| 97 | CALL ADDANG( COSTHE,PHI, CTHETA,RD(1)*PI2, SECPAR(3),SECPAR(4) )
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| 98 | IF ( SECPAR(3) .LT. C(29) ) GOTO 3
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| 99 |
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| 100 | C CHARGE ASSIGNMENT
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| 101 | IF ( ITYPE .EQ. 10 .OR. ITYPE .EQ. 11 .OR.
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| 102 | * ITYPE .EQ. 12 .OR. ITYPE .EQ. 16 ) THEN
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| 103 | SECPAR(1) = CURPAR(1)
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| 104 | ELSE
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| 105 | IF ( RD(2) .LT. 0.5 ) THEN
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| 106 | IADD = 1
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| 107 | ELSE
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| 108 | IADD = 0
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| 109 | ENDIF
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| 110 | IF ( ITYPE .EQ. 13 .OR. ITYPE .EQ. 14 ) THEN
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| 111 | SECPAR(1) = 13 + IADD
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| 112 | ELSEIF ( ITYPE .EQ. 8 .OR. ITYPE .EQ. 9 ) THEN
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| 113 | SECPAR(1) = 8 + IADD
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| 114 | ELSEIF ( ITYPE .EQ. 15 .OR. ITYPE .EQ. 25 ) THEN
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| 115 | SECPAR(1) = 15 + IADD * 10
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| 116 | ENDIF
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| 117 | ENDIF
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| 118 | SECPAR(2) = GFLAB
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| 119 | DO 1 J = 5,8
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| 120 | SECPAR(J) = CURPAR(J)
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| 121 | 1 CONTINUE
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| 122 | CALL TSTACK
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| 123 |
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| 124 | 3 CONTINUE
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| 125 |
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| 126 | C STATISTICS ON ELASTICITY
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| 127 | IN = 1.D0 + SECPAR(2) / GAMMA * 20.D0
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| 128 | IN = MIN( IN, 20 )
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| 129 | IF ( ITYPE .EQ. 13 .OR. ITYPE .EQ. 14 .OR.
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| 130 | * ITYPE .EQ. 15 .OR. ITYPE .EQ. 25 ) THEN
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| 131 | IELNU(IN) = IELNU(IN) + 1
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| 132 | ELSE
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| 133 | IELPI(IN) = IELPI(IN) + 1
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| 134 | ENDIF
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| 135 | RETURN
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| 136 |
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| 137 | C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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| 138 | C RECOIL PARTICLE, NUCLEON ONLY
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| 139 | C FROM SIMPLE RECOIL SPECTRUM COMPUTED
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| 140 | 100 CONTINUE
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| 141 | HELP = MIN( C(10), GAMMA*0.5D0 )
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| 142 | CALL RMMAR( RD,3,1 )
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| 143 | GRLAB = RD(1)*(HELP-1.D0)+ 1.D0
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| 144 | PT = PTRANS(DUMMY)
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| 145 | PLLAB2 = MAX( 1.D-6, PAMA(14)**2*(GRLAB**2-1.D0) )
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| 146 | CTHETA = SQRT( PLLAB2 / (PT**2+PLLAB2) )
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| 147 | IF ( CTHETA .LT. C(27) ) RETURN
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| 148 | CALL ADDANG( COSTHE,PHI, CTHETA,RD(2)*PI2, SECPAR(3),SECPAR(4) )
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| 149 | IF ( SECPAR(3) .LT. C(29) ) RETURN
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| 150 | SECPAR(2)=GRLAB
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| 151 |
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| 152 | C CHARGE ASSIGNEMENT
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| 153 | IF ( RD(3) .GE. 0.5 ) THEN
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| 154 | SECPAR(1) = 14.D0
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| 155 | ELSE
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| 156 | SECPAR(1) = 13.D0
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| 157 | ENDIF
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| 158 |
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| 159 | DO 103 J = 5,8
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| 160 | SECPAR(J) = CURPAR(J)
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| 161 | 103 CONTINUE
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| 162 | CALL TSTACK
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| 163 |
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| 164 | RETURN
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| 165 | END
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