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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount299.9670000 79.0000000 55.0000000 99.9925000 99.9975000 99.9600000 3.5000000 99.8400000 99.9615000 99.9910000Gas Comp 2AMMONIA PPM ETHANOL NITROGEN R134A TETRAFLUOROETHANE NITRIC OXIDE CARBON MONOXIDE 18