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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount235.0000000 99.9910000 79.0000000 99.9865000 81.9375000 99.9670000 99.8810000 99.9600000 99.8400000 99.9640000 99.9925000 99.9975000 94.0000000 66.0000000Gas Comp 2CARBON MONOXIDE 18 R134A TETRAFLUOROETHANE NITROGEN NITRIC OXIDE AMMONIA PPM ETHANOL PPM PROPANE