Relative abundances of H ii (top row) and He iii (second row) for fractal density structures with the specified mean hydrogen number densities and volumes V. The third row shows the calculated escape fractions as a function of photon energy for each of the simulations. While the escape fraction represents the “matter bounded” case in the left hand side model (fesc = 1), the center model represents the “radiation bounded” case (fesc = 0). In all cases the escape fraction for He ii-ionizing photons is smaller than the escape fraction for H i-ionizing photons.
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