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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount299.9460000 99.9975000 79.0000000 55.0000000 87.5000000 81.9375000 99.9977500 99.9978000 61.0000000 99.9550000 99.9935000 88.5000000 99.7700000 97.0000000Gas Comp 2CARBON MONOXIDE 18 NITROGEN NITRIC OXIDE AMMONIA R134A TETRAFLUOROETHANE PPM ETHANOL