Fig. A.1
Optical depth τHISA as a functionof spin temperature THISA at the derived mean temperatures of Ton = 40 K, Toff = 70 K, and Tcont = 20 K (Eq. (1)). The different colors represent varying background fractions p, with values from 0.3 to 1.0. The horizontal black line marks an optical depth of 0.9 that was determined from H I absorption against strong continuum emission.
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