Comparison of the X-ray ionization rate ζ_X as a function of vertical hydrogen column density N_{⟨ H ⟩ ,ver} at radii of 1 au (solid lines), 5 au (dashed lines) and 10 au (dotted line). The red lines are the results from MOCASSIN the black lines are the results from PRODIMO. The 10 au result from MOCASSIN were not available for this test case. The 10 au results have been scaled down by a factor of 10 for better visibility. The grey shaded area indicates a factor of three deviation relative to the PRODIMO results. An isothermal X-ray spectrum with kT_X = 5 keV and L_X = 10²⁹ erg s^-1 is used.