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[]
[null,"Key to groups"]
[]
[]
[null,null,"32, 34, 46, 62, 63, 64, 66, 81"]
[]
[null,null,"9, 10, 11, 13, 14, 17, 37, 39, 42, 52, 54, 56, 76, 78"]
[]
[null,null,"24, 25, 26, 27, 28, 29, 33, 35, 44, 47, 48, 49, 50, 51"]
[null,null,"53, 68, 74, 77, 86, 87, 88"]
[]
[null,null,"45, 55, 65, 67, 69, 70, 73, 75, 82, 85"]
[]
[null,null,"19, 21, 22"]
[]
[null,null,"15, 31, 43, 57, 58, 59, 61, 71, 72, 83"]
[]
[null,null,"36, 38, 80, 84"]
[]
[null,null,"Singletons (not included in the graphs)"]
[]
[null,null,"18, 20: pair, H2O"]
[]
[null,null,"23: Na contamination"]
[]
[null,null,"30: 14N16O+ as sample is 2% HNO3 "]
[]
[null,null,"60, 79: pair"]