aaa
 1  3500. 0 0 10050 ! beam1: type, ener.,  nptype, ngroup, nset
 1  3500. 0 0 10050 ! beam2: type, ener.,  nptype, ngroup, nset
  4.75 ! heavy quark mass
 -1. ! Lambda_5, <=0 for default
  1.  1. !  fact. and ren. scale factors
  50.  0. ! pt,y_lab
 1   ! icalctype
