PDF/spdf/ctq3pd.F

   1 *
   2 * $Id$
   3 *
   4 * $Log$
   5 * Revision 1.1.1.2  1996/10/30 08:27:50  cernlib
   6 * Version 7.04
   7 *
   8 * Revision 1.2  1996/10/29 09:30:59  pdflib
   9 * more LINNUX corrections in DATA statements
  10 *
  11 * Revision 1.1.1.1  1996/04/12 15:29:10  plothow
  12 * Version 7.01
  13 *
  14 *
  15 #include "pdf/pilot.h"
  16       FUNCTION Ctq3Pd (Iset, Iprtn, XX, QQ, Irt)
  17
  18 C            Returns xf(x,Q) -- the momentum fraction distribution !!
  19 C            Returns valence and sea rather than combined flavor distr.
  20
  21 C            Iset : PDF set label
  22
  23 C            Iprtn  : Parton label:   2, 1 = d_ and u_ valence
  24 C                                     0 = gluon
  25 C                            -1, ... -6 = u, d, s, c, b, t sea quarks
  26
  27 C            XX  : Bjorken-x
  28 C            QQ  : scale parameter "Q"
  29 C      Irt : Return code
  30 C      0 : no error
  31 C      1 : parametrization is slightly negative; reset to 0.0.
  32 C          (This condition happens rarely -- only for large x where the
  33 C          absolute value of the parton distribution is extremely small.)
  34
  35 C     IMPLICIT DOUBLE PRECISION (A-H, O-Z)
  36 C+SEQ, IMPDP.
  37
  38       PARAMETER (D0=0D0, D1=1D0, D2=2D0, D3=3D0, D4=4D0, D10=1D1)
  39       Parameter (Nst = 3)
  40
  41 #include "pdf/expdp.inc"
  42      +       P012, P34, P5, PDFD
  43
  44       DIMENSION
  45      >   Iord(Nst), Isch(Nst), Nqrk(Nst),Alm(Nst)
  46      > , Vlm(4:6,Nst), Qms(4:6, Nst)
  47      > , Xmn(Nst), Qmn(Nst), Qmx(Nst)
  48
  49 c                                          --------- CTEQ3M
  50 c
  51       DATA
  52      >  Isch(1), Iord(1), Nqrk(1), Alm(1) /  1,  2,  6, .239  /
  53      >  ,(Vlm(I,1), I=4,6) / .239,    .158,     .063   /
  54      >  ,(Qms(I,1), I=4,6) / 1.60,   5.00,  180.0 /
  55      >  ,Xmn(1), Qmn(1), Qmx(1) /  1.E-6,  1.60,  1.E4  /
  56
  57 c                                          --------- CTEQ3L
  58 c
  59       DATA
  60      >  Isch(2), Iord(2), Nqrk(2), Alm(2) /  1,  1,  6, .177  /
  61      >  ,(Vlm(I,2), I=4,6) / .177,    .132,     .066   /
  62      >  ,(Qms(I,2), I=4,6) / 1.60,   5.00,  180.0 /
  63      >  ,Xmn(2), Qmn(2), Qmx(2) /  1.E-6,  1.60,  1.E4  /
  64
  65 c                                          --------- CTEQ3D
  66 c
  67       DATA
  68      >  Isch(3), Iord(3), Nqrk(3), Alm(3) /  1,  2,  6, .247  /
  69      >  ,(Vlm(I,3), I=4,6) / .247,    .164,     .066   /
  70      >  ,(Qms(I,3), I=4,6) / 1.60,   5.00,  180.0 /
  71      >  ,Xmn(3), Qmn(3), Qmx(3) /  1.E-6,  1.60,  1.E4  /
  72
  73
  74       Data Ist, Lp, Qsto / 0, -10, 1.2345 /
  75
  76       save Ist, Lp, Qsto
  77       save SB, SB2, SB3
  78
  79       X  = XX
  80       QQ = MAX(QQ,Qmn(iset))
  81       Irt = 0
  82       if(Iset.eq.Ist .and. Qsto.eq.QQ) then
  83 C                                             if only change is in x:
  84         if (Iprtn.eq.Lp) goto 100
  85 C                         if change in flv is within "light" partons:
  86         if (Iprtn.ge.-3 .and. Lp.ge.-3) goto 501
  87       endif
  88
  89       Ip = abs(Iprtn)
  90 C                                                  Set up Qi for SB
  91       If (Ip .GE. 4) then
  92          If (QQ .LE. Qms(Ip, Iset)) Then
  93            Ctq3Pd = 0.0
  94            Return
  95          Endif
  96          Qi = Qms(ip, Iset)
  97       Else
  98          Qi = Qmn(Iset)
  99       Endif
 100 C                   Use "standard lambda" of parametrization program
 101       Alam = Alm (Iset)
 102
 103       SBL = LOG(QQ/Alam) / LOG(Qi/Alam)
 104       SB = LOG (SBL)
 105       SB2 = SB*SB
 106       SB3 = SB2*SB
 107
 108  501  Iflv = 3 - Iprtn
 109
 110       Goto (1,2,3, 311) Iset
 111
 112  1    Goto(11,12,13,14,15,16,17,18,19)Iflv
 113 c   Ifl =   2
 114   11  A0=Exp(-0.7266E+00-0.1584E+01*SB +0.1259E+01*SB2-0.4305E-01*SB3)
 115       A1= 0.5285E+00-0.3721E+00*SB +0.5150E+00*SB2-0.1697E+00*SB3
 116       A2= 0.4075E+01+0.8282E+00*SB -0.4496E+00*SB2+0.2107E+00*SB3
 117       A3= 0.3279E+01+0.5066E+01*SB -0.9134E+01*SB2+0.2897E+01*SB3
 118       A4= 0.4399E+00-0.5888E+00*SB +0.4802E+00*SB2-0.1664E+00*SB3
 119       A5= 0.3678E+00-0.8929E+00*SB +0.1592E+01*SB2-0.5713E+00*SB3
 120       goto 100
 121 c   Ifl =   1
 122   12  A0=Exp( 0.2259E+00+0.1237E+00*SB +0.3035E+00*SB2-0.2935E+00*SB3)
 123       A1= 0.5085E+00+0.1651E-01*SB -0.3592E-01*SB2+0.2782E-01*SB3
 124       A2= 0.3732E+01+0.4901E+00*SB +0.2218E+00*SB2-0.1116E+00*SB3
 125       A3= 0.7011E+01-0.6620E+01*SB +0.2557E+01*SB2-0.1360E+00*SB3
 126       A4= 0.8969E+00-0.2429E+00*SB +0.1811E+00*SB2-0.6888E-01*SB3
 127       A5= 0.8636E-01+0.2558E+00*SB -0.3082E+00*SB2+0.2535E+00*SB3
 128       goto 100
 129 c   Ifl =   0
 130   13  A0=Exp(-0.2318E+00-0.9779E+00*SB -0.3783E+00*SB2+0.1037E-01*SB3)
 131       A1=-0.2916E+00+0.1754E+00*SB -0.1884E+00*SB2+0.6116E-01*SB3
 132       A2= 0.5349E+01+0.7460E+00*SB +0.2319E+00*SB2-0.2622E+00*SB3
 133       A3= 0.6920E+01-0.3454E+01*SB +0.2027E+01*SB2-0.7626E+00*SB3
 134       A4= 0.1013E+01+0.1423E+00*SB -0.1798E+00*SB2+0.1872E-01*SB3
 135       A5=-0.5465E-01+0.2303E+01*SB -0.9584E+00*SB2+0.3098E+00*SB3
 136       goto 100
 137 c   Ifl =  -1
 138   14  A0=Exp(-0.2906E+01-0.1069E+00*SB -0.1055E+01*SB2+0.2496E+00*SB3)
 139       A1=-0.2875E+00+0.6571E-01*SB -0.1987E-01*SB2-0.1800E-02*SB3
 140       A2= 0.9854E+01-0.2715E+00*SB -0.7407E+00*SB2+0.2888E+00*SB3
 141       A3= 0.1583E+02-0.7687E+01*SB +0.3428E+01*SB2-0.3327E+00*SB3
 142       A4= 0.9763E+00+0.7599E-01*SB -0.2128E+00*SB2+0.6852E-01*SB3
 143       A5=-0.8444E-02+0.9434E+00*SB +0.4152E+00*SB2-0.1481E+00*SB3
 144       goto 100
 145 c   Ifl =  -2
 146   15  A0=Exp(-0.2328E+01-0.3061E+01*SB +0.3620E+01*SB2-0.1602E+01*SB3)
 147       A1=-0.3358E+00+0.3198E+00*SB -0.4210E+00*SB2+0.1571E+00*SB3
 148       A2= 0.8478E+01-0.3112E+01*SB +0.5243E+01*SB2-0.2255E+01*SB3
 149       A3= 0.1971E+02+0.3389E+00*SB -0.5268E+01*SB2+0.2099E+01*SB3
 150       A4= 0.1128E+01-0.4701E+00*SB +0.7779E+00*SB2-0.3506E+00*SB3
 151       A5=-0.4708E+00+0.3341E+01*SB -0.3375E+01*SB2+0.1353E+01*SB3
 152       goto 100
 153 c   Ifl =  -3
 154   16  A0=Exp(-0.3780E+01+0.2499E+01*SB -0.4962E+01*SB2+0.1936E+01*SB3)
 155       A1=-0.2639E+00-0.1575E+00*SB +0.3584E+00*SB2-0.1646E+00*SB3
 156       A2= 0.8082E+01+0.2794E+01*SB -0.5438E+01*SB2+0.2321E+01*SB3
 157       A3= 0.1811E+02-0.2000E+02*SB +0.1951E+02*SB2-0.6904E+01*SB3
 158       A4= 0.9822E+00+0.4972E+00*SB -0.8690E+00*SB2+0.3415E+00*SB3
 159       A5= 0.1772E+00-0.6078E+00*SB +0.3341E+01*SB2-0.1473E+01*SB3
 160       goto 100
 161 c   Ifl =  -4
 162   17  A0=SB** 0.1122E+01*Exp(-0.4232E+01-0.1808E+01*SB +0.5348E+00*SB2)
 163       A1=-0.2824E+00+0.5846E+00*SB -0.7230E+00*SB2+0.2419E+00*SB3
 164       A2= 0.5683E+01-0.2948E+01*SB +0.5916E+01*SB2-0.2560E+01*SB3
 165       A3= 0.2051E+01+0.4795E+01*SB -0.4271E+01*SB2+0.4174E+00*SB3
 166       A4= 0.1737E+00+0.1717E+01*SB -0.1978E+01*SB2+0.6643E+00*SB3
 167       A5= 0.8689E+00+0.3500E+01*SB -0.3283E+01*SB2+0.1026E+01*SB3
 168       goto 100
 169 c   Ifl =  -5
 170   18  A0=SB** 0.9906E+00*Exp(-0.1496E+01-0.6576E+01*SB +0.1569E+01*SB2)
 171       A1=-0.2140E+00-0.6419E-01*SB -0.2741E-02*SB2+0.3185E-02*SB3
 172       A2= 0.5781E+01+0.1049E+00*SB -0.3930E+00*SB2+0.5174E+00*SB3
 173       A3=-0.9420E+00+0.5511E+00*SB +0.8817E+00*SB2+0.1903E+01*SB3
 174       A4= 0.2418E-01+0.4232E-01*SB -0.1244E-01*SB2-0.2365E-01*SB3
 175       A5= 0.7664E+00+0.1794E+01*SB -0.4917E+00*SB2-0.1284E+00*SB3
 176       goto 100
 177 c   Ifl =  -6
 178   19  A0=SB** 0.1000E+01*Exp(-0.8460E+01+0.1154E+01*SB +0.8838E+01*SB2)
 179       A1=-0.4316E-01-0.2976E+00*SB +0.3174E+00*SB2-0.1429E+01*SB3
 180       A2= 0.4910E+01+0.2273E+01*SB +0.5631E+01*SB2-0.1994E+02*SB3
 181       A3= 0.1190E+02-0.2000E+02*SB -0.2000E+02*SB2+0.1292E+02*SB3
 182       A4= 0.5771E+00-0.2552E+00*SB +0.7510E+00*SB2+0.6923E+00*SB3
 183       A5= 0.4402E+01-0.1627E+01*SB -0.2085E+01*SB2-0.6737E+01*SB3
 184       goto 100
 185
 186  2    Goto(21,22,23,24,25,26,27,28,29)Iflv
 187 c   Ifl =   2
 188   21  A0=Exp( 0.1141E+00+0.4764E+00*SB -0.1745E+01*SB2+0.7728E+00*SB3)
 189       A1= 0.4275E+00-0.1290E+00*SB +0.3609E+00*SB2-0.1689E+00*SB3
 190       A2= 0.3000E+01+0.2946E+01*SB -0.4117E+01*SB2+0.1989E+01*SB3
 191       A3=-0.1302E+01+0.2322E+01*SB -0.4258E+01*SB2+0.2109E+01*SB3
 192       A4= 0.2586E+01-0.1920E+00*SB -0.3754E+00*SB2+0.2731E+00*SB3
 193       A5=-0.2251E+00-0.5374E+00*SB +0.2245E+01*SB2-0.1034E+01*SB3
 194       goto 100
 195 c   Ifl =   1
 196   22  A0=Exp( 0.1907E+00+0.4205E-01*SB +0.2752E+00*SB2-0.3171E+00*SB3)
 197       A1= 0.4611E+00+0.2331E-01*SB -0.3403E-01*SB2+0.3174E-01*SB3
 198       A2= 0.3504E+01+0.5739E+00*SB +0.2676E+00*SB2-0.1553E+00*SB3
 199       A3= 0.7452E+01-0.6742E+01*SB +0.2849E+01*SB2-0.1964E+00*SB3
 200       A4= 0.1116E+01-0.3435E+00*SB +0.2865E+00*SB2-0.1288E+00*SB3
 201       A5= 0.6659E-01+0.2714E+00*SB -0.2688E+00*SB2+0.2763E+00*SB3
 202       goto 100
 203 c   Ifl =   0
 204   23  A0=Exp(-0.7631E+00-0.7241E+00*SB -0.1170E+01*SB2+0.5343E+00*SB3)
 205       A1=-0.3573E+00+0.3469E+00*SB -0.3396E+00*SB2+0.9188E-01*SB3
 206       A2= 0.5604E+01+0.7458E+00*SB -0.5082E+00*SB2+0.1844E+00*SB3
 207       A3= 0.1549E+02-0.1809E+02*SB +0.1162E+02*SB2-0.3483E+01*SB3
 208       A4= 0.9881E+00+0.1364E+00*SB -0.4421E+00*SB2+0.2051E+00*SB3
 209       A5=-0.9505E-01+0.3259E+01*SB -0.1547E+01*SB2+0.2918E+00*SB3
 210       goto 100
 211 c   Ifl =  -1
 212   24  A0=Exp(-0.2740E+01-0.7987E-01*SB -0.9015E+00*SB2-0.9872E-01*SB3)
 213       A1=-0.3909E+00+0.1244E+00*SB -0.4487E-01*SB2+0.1277E-01*SB3
 214       A2= 0.9163E+01+0.2823E+00*SB -0.7720E+00*SB2-0.9360E-02*SB3
 215       A3= 0.1080E+02-0.3915E+01*SB -0.1153E+01*SB2+0.2649E+01*SB3
 216       A4= 0.9894E+00-0.1647E+00*SB -0.9426E-02*SB2+0.2945E-02*SB3
 217       A5=-0.3395E+00+0.6998E+00*SB +0.7000E+00*SB2-0.6730E-01*SB3
 218       goto 100
 219 c   Ifl =  -2
 220   25  A0=Exp(-0.2449E+01-0.3513E+01*SB +0.4529E+01*SB2-0.2031E+01*SB3)
 221       A1=-0.4050E+00+0.3411E+00*SB -0.3669E+00*SB2+0.1109E+00*SB3
 222       A2= 0.7470E+01-0.2982E+01*SB +0.5503E+01*SB2-0.2419E+01*SB3
 223       A3= 0.1503E+02+0.1638E+01*SB -0.8772E+01*SB2+0.3852E+01*SB3
 224       A4= 0.1137E+01-0.1006E+01*SB +0.1485E+01*SB2-0.6389E+00*SB3
 225       A5=-0.5299E+00+0.3160E+01*SB -0.3104E+01*SB2+0.1219E+01*SB3
 226       goto 100
 227 c   Ifl =  -3
 228   26  A0=Exp(-0.3640E+01+0.1250E+01*SB -0.2914E+01*SB2+0.8390E+00*SB3)
 229       A1=-0.3595E+00-0.5259E-01*SB +0.3122E+00*SB2-0.1642E+00*SB3
 230       A2= 0.7305E+01+0.9727E+00*SB -0.9788E+00*SB2-0.5193E-01*SB3
 231       A3= 0.1198E+02-0.1799E+02*SB +0.2614E+02*SB2-0.1091E+02*SB3
 232       A4= 0.9882E+00-0.6101E+00*SB +0.9737E+00*SB2-0.4935E+00*SB3
 233       A5=-0.1186E+00-0.3231E+00*SB +0.3074E+01*SB2-0.1274E+01*SB3
 234       goto 100
 235 c   Ifl =  -4
 236   27  A0=SB** 0.1122E+01*Exp(-0.3718E+01-0.1335E+01*SB +0.1651E-01*SB2)
 237       A1=-0.4719E+00+0.7509E+00*SB -0.8420E+00*SB2+0.2901E+00*SB3
 238       A2= 0.6194E+01-0.1641E+01*SB +0.4907E+01*SB2-0.2523E+01*SB3
 239       A3= 0.4426E+01-0.4270E+01*SB +0.6581E+01*SB2-0.3474E+01*SB3
 240       A4= 0.2683E+00+0.9876E+00*SB -0.7612E+00*SB2+0.1780E+00*SB3
 241       A5=-0.4547E+00+0.4410E+01*SB -0.3712E+01*SB2+0.1245E+01*SB3
 242       goto 100
 243 c   Ifl =  -5
 244   28  A0=SB** 0.9838E+00*Exp(-0.2548E+01-0.7660E+01*SB +0.3702E+01*SB2)
 245       A1=-0.3122E+00-0.2120E+00*SB +0.5716E+00*SB2-0.3773E+00*SB3
 246       A2= 0.6257E+01-0.8214E-01*SB -0.2537E+01*SB2+0.2981E+01*SB3
 247       A3=-0.6723E+00+0.2131E+01*SB +0.9599E+01*SB2-0.7910E+01*SB3
 248       A4= 0.9169E-01+0.4295E-01*SB -0.5017E+00*SB2+0.3811E+00*SB3
 249       A5= 0.2402E+00+0.2656E+01*SB -0.1586E+01*SB2+0.2880E+00*SB3
 250       goto 100
 251 c   Ifl =  -6
 252   29  A0=SB** 0.1001E+01*Exp(-0.6934E+01+0.3050E+01*SB -0.6943E+00*SB2)
 253       A1=-0.1713E+00-0.5167E+00*SB +0.1241E+01*SB2-0.1703E+01*SB3
 254       A2= 0.6169E+01+0.3023E+01*SB -0.1972E+02*SB2+0.1069E+02*SB3
 255       A3= 0.4439E+01-0.1746E+02*SB +0.1225E+02*SB2+0.8350E+00*SB3
 256       A4= 0.5458E+00-0.4586E+00*SB +0.9089E+00*SB2-0.4049E+00*SB3
 257       A5= 0.3207E+01-0.3362E+01*SB +0.5877E+01*SB2-0.7659E+01*SB3
 258       goto 100
 259
 260  3    Goto(31,32,33,34,35,36,37,38,39)Iflv
 261 c   Ifl =   2
 262   31  A0=Exp( 0.3961E+00+0.4914E+00*SB -0.1728E+01*SB2+0.7257E+00*SB3)
 263       A1= 0.4162E+00-0.1419E+00*SB +0.3680E+00*SB2-0.1618E+00*SB3
 264       A2= 0.3248E+01+0.3028E+01*SB -0.4307E+01*SB2+0.1920E+01*SB3
 265       A3=-0.1100E+01+0.2184E+01*SB -0.3820E+01*SB2+0.1717E+01*SB3
 266       A4= 0.2082E+01-0.2756E+00*SB +0.3043E+00*SB2-0.1260E+00*SB3
 267       A5=-0.4822E+00-0.5706E+00*SB +0.2243E+01*SB2-0.9760E+00*SB3
 268       goto 100
 269 c   Ifl =   1
 270   32  A0=Exp( 0.2148E+00+0.5814E-01*SB +0.2734E+00*SB2-0.2902E+00*SB3)
 271       A1= 0.4810E+00+0.1657E-01*SB -0.3800E-01*SB2+0.3125E-01*SB3
 272       A2= 0.3509E+01+0.3923E+00*SB +0.4010E+00*SB2-0.1932E+00*SB3
 273       A3= 0.7055E+01-0.6552E+01*SB +0.3466E+01*SB2-0.5657E+00*SB3
 274       A4= 0.1061E+01-0.3453E+00*SB +0.4089E+00*SB2-0.1817E+00*SB3
 275       A5= 0.8687E-01+0.2548E+00*SB -0.2967E+00*SB2+0.2647E+00*SB3
 276       goto 100
 277 c   Ifl =   0
 278   33  A0=Exp(-0.4665E+00-0.7554E+00*SB -0.3323E+00*SB2-0.2734E-04*SB3)
 279       A1=-0.3359E+00+0.2395E+00*SB -0.2377E+00*SB2+0.7059E-01*SB3
 280       A2= 0.5451E+01+0.6086E+00*SB +0.8606E-01*SB2-0.1425E+00*SB3
 281       A3= 0.1026E+02-0.9352E+01*SB +0.4879E+01*SB2-0.1150E+01*SB3
 282       A4= 0.9935E+00-0.5017E-01*SB -0.1707E-01*SB2-0.1464E-02*SB3
 283       A5=-0.4160E-01+0.2305E+01*SB -0.1063E+01*SB2+0.3211E+00*SB3
 284       goto 100
 285 c   Ifl =  -1
 286   34  A0=Exp(-0.3323E+01+0.2296E+00*SB -0.1109E+01*SB2+0.2223E+00*SB3)
 287       A1=-0.3410E+00+0.8847E-01*SB -0.1111E-01*SB2-0.5927E-02*SB3
 288       A2= 0.9753E+01-0.5182E+00*SB -0.4670E+00*SB2+0.1921E+00*SB3
 289       A3= 0.1977E+02-0.1600E+02*SB +0.9481E+01*SB2-0.1864E+01*SB3
 290       A4= 0.9818E+00+0.2839E-02*SB -0.1188E+00*SB2+0.3584E-01*SB3
 291       A5=-0.7934E-01+0.1004E+01*SB +0.3704E+00*SB2-0.1220E+00*SB3
 292       goto 100
 293 c   Ifl =  -2
 294   35  A0=Exp(-0.2714E+01-0.2868E+01*SB +0.3700E+01*SB2-0.1671E+01*SB3)
 295       A1=-0.3893E+00+0.3341E+00*SB -0.3897E+00*SB2+0.1420E+00*SB3
 296       A2= 0.8359E+01-0.3267E+01*SB +0.5327E+01*SB2-0.2245E+01*SB3
 297       A3= 0.2359E+02-0.5669E+01*SB -0.4602E+01*SB2+0.3153E+01*SB3
 298       A4= 0.1106E+01-0.4745E+00*SB +0.7739E+00*SB2-0.3417E+00*SB3
 299       A5=-0.5557E+00+0.3433E+01*SB -0.3390E+01*SB2+0.1354E+01*SB3
 300       goto 100
 301 c   Ifl =  -3
 302   36  A0=Exp(-0.3985E+01+0.2855E+01*SB -0.5208E+01*SB2+0.1937E+01*SB3)
 303       A1=-0.3337E+00-0.1150E+00*SB +0.3691E+00*SB2-0.1709E+00*SB3
 304       A2= 0.7968E+01+0.3641E+01*SB -0.6599E+01*SB2+0.2642E+01*SB3
 305       A3= 0.1873E+02-0.1999E+02*SB +0.1734E+02*SB2-0.5813E+01*SB3
 306       A4= 0.9731E+00+0.5082E+00*SB -0.8780E+00*SB2+0.3231E+00*SB3
 307       A5=-0.5542E-01-0.4189E+00*SB +0.3309E+01*SB2-0.1439E+01*SB3
 308       goto 100
 309 c   Ifl =  -4
 310   37  A0=SB** 0.1105E+01*Exp(-0.3952E+01-0.1901E+01*SB +0.5137E+00*SB2)
 311       A1=-0.3543E+00+0.6055E+00*SB -0.6941E+00*SB2+0.2278E+00*SB3
 312       A2= 0.5955E+01-0.2629E+01*SB +0.5337E+01*SB2-0.2300E+01*SB3
 313       A3= 0.1933E+01+0.4882E+01*SB -0.3810E+01*SB2+0.2290E+00*SB3
 314       A4= 0.1806E+00+0.1655E+01*SB -0.1893E+01*SB2+0.6395E+00*SB3
 315       A5= 0.4790E+00+0.3612E+01*SB -0.3152E+01*SB2+0.9684E+00*SB3
 316       goto 100
 317 c   Ifl =  -5
 318   38  A0=SB** 0.9818E+00*Exp(-0.1825E+01-0.7464E+01*SB +0.2143E+01*SB2)
 319       A1=-0.2604E+00-0.1400E+00*SB +0.1702E+00*SB2-0.8476E-01*SB3
 320       A2= 0.6005E+01+0.6275E+00*SB -0.2535E+01*SB2+0.2219E+01*SB3
 321       A3=-0.9067E+00+0.1149E+01*SB +0.1974E+01*SB2+0.4716E+01*SB3
 322       A4= 0.3915E-01+0.5945E-01*SB -0.9844E-01*SB2+0.2783E-01*SB3
 323       A5= 0.5500E+00+0.1994E+01*SB -0.6727E+00*SB2-0.1510E+00*SB3
 324       goto 100
 325 c   Ifl =  -6
 326   39  A0=SB** 0.1002E+01*Exp(-0.8553E+01+0.3793E+00*SB +0.9998E+01*SB2)
 327       A1=-0.5870E-01-0.2792E+00*SB +0.6526E+00*SB2-0.1984E+01*SB3
 328       A2= 0.4716E+01+0.4473E+00*SB +0.1128E+02*SB2-0.1937E+02*SB3
 329       A3= 0.1289E+02-0.1742E+02*SB -0.1983E+02*SB2-0.9274E+00*SB3
 330       A4= 0.5647E+00-0.2732E+00*SB +0.1074E+01*SB2+0.5981E+00*SB3
 331       A5= 0.4390E+01-0.1262E+01*SB -0.9026E+00*SB2-0.9394E+01*SB3
 332       goto 100
 333
 334  311  stop 'This option is not currently supported.'
 335
 336  100  CONTINUE
 337       P012   = A0 *(x**A1) *((D1-x)**A2)
 338       P34    = (D1+A3*(x**A4))
 339       P5     = (log(D1+D1/x))**A5
 340 C
 341       PDFD   = P012 * P34 * P5
 342       PDF    = PDFD
 343 C
 344       Ctq3Pd = PDF
 345       if(Ctq3Pd.lt.D0) then
 346         Ctq3Pd = D0
 347         Irt=1
 348       endif
 349
 350       Ist = Iset
 351
 352       Lp  = Iprtn
 353       Qsto = QQ
 354
 355       Return
 356 C                                  -----------------------
 357       ENTRY Wlamd3 (Iset, Iorder, Neff)
 358
 359 C     Returns the EFFECTIVE QCD lambda values for order=Iorder and
 360 C     effective # of flavors = Neff for each of the PDF sets.
 361
 362       Iorder = Iord (Iset)
 363       Wlamd3 = VLM  (Neff, Iset)
 364
 365       RETURN
 366
 367 C                         *************************
 368       END