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Fig. A.1


Population diagrams of HNCO, HNCS, HC3N, and NO for a range of molecular hydrogen densities (nH2, bottom left corner) and a given input value for the kinetic temperature and total column density (Tkin and Ntot; top right corner); the dotted line connects the LTE points. Only the transitions detected in this work are represented in this diagram (Table 3). For HNCO, the transitions within the Ka = 0 and Ka = 1 ladders are indicated by empty and filled symbols, respectively. For NO, we plot the three hyperfine components with the highest values of the Einstein coefficient (Aul) for each of the Π and Π+ doublets at 250 and 350  GHz (i.e. at Eu = 19.2 and 36.1 K), the three hyperfine components with the largest Aul of the Π+ band at 150  GHz (i.e. at Eu = 7.2 K) and the Π(3/2,3/2)–(1/2,1/2) line, which is spectrally isolated in our data, at 150 GHz (Eu = 7.2 K). These calculations have been done with a LVG radiative transfer code (MADEX) – see text in this appendix.

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