Dimensionless frequency distribution of photons escaping from an isothermal (2 × 104 K) homogeneous sphere with column density of 2 × 1020NH from the center to the surface. A Hubble-like velocity prescription given by Eq. (B.7) is assigned. The different lines correspond to different maximum collapse velocities: 20 km s-1 (line), 200 km s-1 (dashed), 2000 km s-1 (dotted).
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