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- By CategoryMixed GasesGas Comp 4PPM HEXANEGas Comp Amount199.9974000 99.9991000 98.9900000 99.9989000 82.4940000 90.4000000 99.9991805 99.9947900 99.9892000 99.6894000 82.4100000 99.9800000 80.4875000 88.7500000 89.4900000Gas Comp 1NITROGEN ETHYLENE NITROUS OXIDE PPM XENON