Ionization structure in a pure hydrogen gas from four model codes using different approaches for computing the radiative transfer: C2-Ray and our method (ray-tracing), CRASH (Monte Carlo), and OTVET (variable Eddington tensor method). The model parameters are as specified by Iliev et al. (2006): particle density 10-3 cm-3; illumination by a monochromatic source emitting 5 × 1048 hydrogen-ionizing photons/s; box size 6.6 kpc. Both ray tracing codes give practically identical results.
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