Table 2. Carbonyl C=O Group to Saturated Aliphatic C-C-H Group Molar and Average OM/OC Ratios for the Four Sampling Platforms and Air Mass Categories Platform C=O/C-H Molar Ratioa OM/OCb Twin Otter 0.1 (90) 1.4 (0.12) n = 25 R/V Ronald H. Brown 0.5 (99.9) 1.6 (0.14) n = 60 Appledore Island 0.4 (99.9) 1.5 (0.16) n = 79 Chebogue Point 0.5 (99.9) (Canada: 0.5 (99.9); United States: 0.3 (<75)) 1.6 (0.14), n = 74 (Canada: 1.6 (0.11), n = 22; United States: 1.6 (0.18), n = 9) /TBL aThe significance of each linear regression was calculated by t-test and is reported in brackets. bStandard deviation is reported between brackets, where "n" indicates number of samples for each platform and category.