Open Access

Fig. A.1


Modelling of N2H+ (1-0) transitions in the prestellar core L1544. The data, from Redaelli et al. (2018), were observed with the same instrumental setup presented in Sect. 2. The right panel shows the zoomed-in image of the grey-shaded area in the left panel, highlighting the problem with the hyperfine intensity estimation in the central triplet.

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