Fig. 8
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Scatter plot of the distribution of the HC3N* column density as a function of upper level energy. The different markers represent different types of hot cores with different numbers of HC3N* emission lines. The two horizontal dashed red lines represent the two distinguishing values for the column density of 1.9 × 1016 cm−2 and 7.6 × 1016 cm−2, respectively.
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