Maximum spin temperature (Eq. (11)) of the absorption features assuming p = 0.9. The black contours show the HISA column density map assuming THISA = 40 K, p = 0.9, and the contour levels are 1.5, 3.5, and 5.5 × 1020 cm−2 with a smoothing of 3 pixels. Regions with strong continuum emission are not reliable, such as SNR W44 and G34.256+0.146 (see Fig. 1).
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