Fig. 6
N2H+(1–0) optical depth versus the ratio of N2H+(1–0) and N2H+(3–2) integrated intensities. The four plots represent RADEX calculations with different temperatures: top left 10 K; top right 15 K; bottom left 20 K; bottom right 25 K. The black dashed contours represent the logarithm of the line width times the column density, log (NN2H+/Δv) with a contour step of 0.1. The red dashed contours are log (nH2) with a contour step of 0.2. The lowest and highest contour values are given in each plot. The values of the sources in Table 4 are plotted by black dots.
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