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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount299.9990000 99.9901000 2.0000000 99.9519000 99.9600000 77.5000000 99.9910000 104.2000000 79.0000000 99.9460000 99.9960000 99.9975000 35.0000000 99.8400000 99.9978000Gas Comp 2NITRIC OXIDE PPM ETHANOL AIR NITROGEN R134A TETRAFLUOROETHANE AMMONIA CARBON MONOXIDE 18