Concentration measurements. CMS concentration measurements influence other inferred quantities (e.g., emission source and rate), and as such, we directly compare concentration data between CMS solutions. To account for the fact that none of the sensors are exactly co-located, we select the two closest sensors for each pair of CMS solutions for this comparison. The distances between these selected sensors are as follows: 2.83 m between solutions A and B, 10.03 m between solutions B and C, and 4.61 m between solutions A and C. The circled sensor pairs in Figure are the sensors selected for this comparison. Because the sensor pairs are not exactly co-located, we limit our conclusions about concentration data to broad statements about their distribution, rather than specific differences in, e.g., the amplitude of a given concentration enhancement.