CALL ATROBO(0.,0.,BEX,BEY,BEZ,IMIN,IMAX,IERROR)
IF(IERROR.NE.0) RETURN
C.....ROTATE TO Z-AXIS....
- CTH=P(JL,3)/SQRT(P(JL,4)**2-P(JL,5)**2)
+ PABS=(P(JL,4)-P(JL,5))*(P(JL,4)+P(JL,5))
+ IF (PABS .GT. 0) THEN
+ CTH=P(JL,3)/SQRT(PABS)
+ ELSE
+ CTH=SIGN(1.,P(JL,3))
+ ENDIF
IF(ABS(CTH).GT.1.0) CTH=MAX(-1.,MIN(1.,CTH))
THETA=ACOS(CTH)
PHI=ULANGL_HIJING(P(JL,1),P(JL,2))