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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount199.9595000 99.9974000 99.5000000 99.7100000 77.3200000 53.7860000 83.5400000 99.9899940 99.9999250 99.9395000 99.9730000Gas Comp 1NITROGEN DIOXIDE NITROGEN PPM CARBON DIOXIDE NITROGEN