Entropy (top panel), temperature, pressure, density, and He ii ionization fraction nHe ii/ (nHe i + nHe ii + nHe iii) (bottom panel) as function of the horizontal and vertical coordinates at time t = 1.40 × 107 s, which corresponds to an expanding phase. Pseudo-streamlines are shown as black solid lines. Surfaces of constant Rosseland optical depth are shown by white lines: τR = 1 (solid line), τR = 10-2 (dashed line), τR = 10-4 (dashed-dotted line).
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