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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount288.5000000 4.0000000 99.9999500 99.7700000 79.0000000 99.9991500 99.9550000 99.9935000 99.9200000 99.8935000 96.5000000 82.5000000 99.9975000 61.0000000 55.0000000Gas Comp 2CARBON MONOXIDE 18 NITRIC OXIDE AMMONIA PPM ETHANOL R134A TETRAFLUOROETHANE OXYGEN NITROGEN