Column densities of HCN (top panel) and HNC (bottom panel) 15N isotopologues plotted against those of the 14N species for all the cores in the sample. The cores are classified as active (red), intermediate (green), and quiescent (blue). Black indicates cores with no known classification. Different symbols are used to denote different clouds: IRDC C (circle), IRDC F(star), IRDC G (square), and IRDC H (triangle). The straight lines indicate the lowest and highest value of the corresponding 14N/15N ratio for each molecule.
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