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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount299.9550000 88.5000000 99.8200000 99.9975000 61.0000000 35.0000000 79.0000000 99.7700000 99.9935000 104.2000000Gas Comp 2AMMONIA R134A TETRAFLUOROETHANE NITRIC OXIDE NITROGEN PPM ETHANOL CARBON MONOXIDE 18