no_digested

beginning[beta_a] =  10
beginning[beta_b] =  10

parameter[geometry] = open
beginning[e_tot] = 1e9

pfork: photon_fork, to_line = l2, superimpose, ref = d1
fork2: fork, to_line = l1, to_element = m, new_branch = F
ff: fork, to_line = mm, to_element = m3\1

d1: pipe, l = 1
d2: pipe, l = 1
m: marker

m3: marker
multi: line[multipass] = (m3)
mm: line = (multi, multi)
mm[p0c] = 1e4

l1: line = (d1, m)

l2: line = (d2, fork2, ff)
l2[e_tot] = 100

use, l1