Fig. 3

RADEX predictions of the rotation temperatures as a function of H2 density for the transitions of H13CO+, H13CN, HC15N, HNC, SiO, and HNCO (listed in Table A.1), and transitions of c-C3H2, l-C3H2, SO, and HC3N (listed in Table A.1 by Muller et al. 2011). We assume TCMB = 5.14 K, Tkin = 50 K (blue), and Tkin = 100 K (red). The rotation temperature derived from the observations of two (or more) transitions is the average of the corresponding rotation temperatures curves.
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