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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount299.9975000 99.9977500 99.9935000 99.9999400 99.8900000 88.5000000 99.9550000 99.7700000 61.0000000 79.0000000 98.0000000 99.9460000 35.0000000 81.9375000Gas Comp 2R134A TETRAFLUOROETHANE NITRIC OXIDE HELIUM AMMONIA NITROGEN PPM ETHANOL CARBON MONOXIDE 18