pinit: photon_init, energy_distribution = curve, 
          energy_probability_curve = {call::init_e_prob.bmad},
          sig_x = 1e-5, sig_y = 1e-6, spatial_distribution = uniform, E_center_relative_to_ref = False

cst: crystal, b_param = -0.6, crystal_type = "Si(620)", use_reflectivity_table = T,
          reflectivity_table = {polarization = sigma, call::reflect_pi.bmad}, 
          reflectivity_table = {polarization = pi, call::reflect_pi.bmad}

parameter[geometry] = open
parameter[particle] = photon
beginning[e_tot] = 7.25e3

xr: line = (pinit, cst)
use, xr
no_digested
parameter[ran_seed] = 123456