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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount199.9999250 88.7500000 99.9974000 99.9200000 12.0000000 82.5800000 99.9000000 83.5400000 99.9100000 1.1000000 99.9975000Gas Comp 1PROPANE PPM CARBONYL SULFIDE NITROGEN NITROUS OXIDE