Image Details
Caption: Figure 5.
Fraction of the sky covered by optically thick gas to optical/UV and X-ray radiation as a function of time. Solid black lines represent the fraction of the sky, χ cold, 22, covered by cold gas in the torus with column densities N ⩾ 10 22 cm −2. Dotted red lines show the fraction of the sky, χ 24, covered by total column densities N ⩾ 10 24 cm −2.
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