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Fig. 15
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Plot showing 
(solid lines) and 4.8 GHz optical depth (dashed lines) as a function of H2 density for Tk = 180 K, p = 1.15, and W = 1 for different dust temperatures. A maser path length of 1017 cm and line width of 1 km s−1 was used to calculate the H2CO abundance.
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