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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount255.0000000 99.9975000 99.9935000 99.9200000 99.7700000 30.0000000 88.5000000 99.9989000 99.9819000 79.0000000 99.9550000 61.0000000 99.9750000Gas Comp 2AMMONIA CARBON MONOXIDE 18 NITRIC OXIDE R134A TETRAFLUOROETHANE PPM ETHANOL NITROGEN