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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount179.4875000 65.0000000 99.9969000 99.9150000 79.9920000 71.0000000 83.7325000 67.6000000 99.9370000 83.5400000 95.9982000Gas Comp 1NITROGEN NITROGEN DIOXIDE NITROGEN HELIUM