Fig. 2
Top left panel: HCN fractional abundance plotted as a function of H2 column density in logarithmic scales. The rest of the panels show the correlations found between the derived fractional abundances of the molecules. From top right to bottom panel, the panels plot x(HCN) versus x(HNC), x(HNC) versus x(HCO+), x(HCN) versus x(N2H+), and x(HNC) versus x(N2H+) in logarithmic scales. The solid lines show the least squares fit to the data (see text for details).
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