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- By CategoryMixed GasesGas Comp Amount299.9950000Gas Comp Amount199.9948400 99.9910000 78.5375000 99.9739500 99.9000000 50.0000000 99.7900000 84.0325000 99.9987500 77.5000000Gas Comp 1PPM NITROGEN DIOXIDE HELIUM 3 PPM AMMONIA NITROGEN