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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount195.9982000 83.5400000 79.1400000 81.2000000 82.4940000 50.0000000 99.9991805 78.0000000 88.9670000 99.9739500 99.9670000 93.8140000Gas Comp 1PPM NITROGEN DIOXIDE NITROGEN HELIUM 3 PPM AMMONIA