5 * Revision 1.1.1.2 1996/10/30 08:31:58 cernlib
8 * Revision 1.1.1.1 1996/04/12 15:30:07 plothow
12 #include "pdf/pilot.h"
13 C----------------------------------------------------------------------
16 PARAMETER (Q02=0.5,ALAM2=0.045*0.045)
17 PARAMETER (AL0=0.7, BET0=3.21, ALPRM=-0.19, BETPRM=0.82)
19 DATA ZERO/0./,HALF/0.5/,ONE/1./,TWO/2./,THRE/3./
20 DATA IRAZ/0/, Q2OLD/-1./
25 S = LOG( LOG( MAX( Q02,Q2L)/ALAM2)/ LOG( Q02/ALAM2))
26 ALPHA = AL0 + ALPRM *S
27 BETA = BET0 + BETPRM*S
28 AV = THRE*GAMMA(ALPHA+BETA+ONE)/
29 1 (GAMMA(ALPHA)*GAMMA(BETA+ONE))
31 VALDIS=AV * XX**ALPHA * (ONE-XX)**BETA