Fig. A.1
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Comparison of EPF results for N2H+ when the HFS of the J = 1 − 0 line is taken into account (Sect. A) or is ignored. Frame a shows the Tex and TR values for Tkin = 20 K, with n(H2) = 105 cm−3 and N(N2H+) = 1014 cm−2 (cyan circle in frame b). The assumed line width is FWHM = 1 km s−1. Frame b shows the ratio of Tex(1-0) values when the HFS is taken into account and when it is ignored.
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