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- By CategoryMixed GasesGas Comp Amount220.9000000Gas Comp Amount199.9984000 99.9948400 99.9791600 99.9997000 99.9499500 79.4780000 79.1000000 79.4900000 99.9983000 98.8900000Gas Comp 1HELIUM 3 NITROGEN DIOXIDE NITROGEN CARBON MONOXIDE PPM PHOSPHINE