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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount299.9935000 99.9550000 30.0000000 99.7700000 88.9175000 99.9200000 99.9975000 35.0000000 88.5000000 104.2000000 79.0000000 61.0000000 73.0000000 99.9730000Gas Comp 2AMMONIA R134A TETRAFLUOROETHANE NITRIC OXIDE NITROGEN CARBON MONOXIDE 18 AIR PPM ETHANOL