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. 2015 Sep 25;1(8):e1500377. doi: 10.1126/sciadv.1500377

Fig. 2. (A and B) Comparison of argon abundances to water (A) and to molecular nitrogen (B).

Fig. 2

(A and B) Relative abundances of 36Ar versus H2O (A) and N2 (B). 36Ar abundances were measured relative to water and molecular nitrogen during four periods in October 2014, when Rosetta was close to 67P/CG (10 km). Individual measurements cover 20 s. Measured particles per 20 s are plotted. Ratios are molecular ratios. (A) Large spread of the relative abundances due to the high temporal variability and spatial heterogeneity of the coma (7). (B) Good correlation between 36Ar and N2 due to their similar volatility.