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- By CategoryMixed GasesGas Comp Amount299.9950000Gas Comp Amount199.9987500 99.9948400 99.9739500 99.9917500 99.9910000 84.0325000 74.9500000 80.4875000 99.9964000 50.0000000 99.9000000Gas Comp 1HELIUM 3 NITROGEN AIR PPM AMMONIA PPM NITROGEN DIOXIDE