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Fig. 5
Compilation of N2H+(1 − 0) Nobeyama 45 m single-dish spectrum toward IRDC 18310 (black histogram with green fit) and PdBI spectrum toward mm1 (red histogram). The PdBI data are multiplied by 5 for clarity. Fit results to the whole N2H+(1 − 0) hyperfine structure are given in the panel.
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