Fig. 2
Comparison between model and observations for the SEST (bottom panel) and IRAM (middle panel) N2H+J = 1−0 line. The top panel shows the CSO N2H+J = 3−2 line. In each panel, we show the offset between the position observed and the core center. For each spectrum, the gray area indicates the variation of intensity obtained by varying the N2H+ abundance as indicated in Fig. 5.
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