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- By CategoryMixed GasesGas Comp Amount299.9950000Gas Comp Amount199.9964000 99.9987500 50.0000000 99.9000000 99.9910000 99.9650000 84.0325000 99.9739500 98.8900000 99.9948400 74.9500000Gas Comp 1PPM NITROGEN DIOXIDE NITROGEN HELIUM 3 PPM AMMONIA