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Fig. 8
Comparison of optical depths for a number of transitions. The calculations were done for Td = 100 K, Wd = 1.0, and WH ii = 1.0. The solid lines are for Tk = 180 K with nH2 = 1.3 × 105 cm-3 and the dashed lines for Tk = 300 K with nH2 = 4 × 105 cm-3. The emission measure is indicated in each of the panels.
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