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- By CategoryMixed GasesGas Comp Amount275.0000000Gas Comp Amount199.9925000 99.9992000 99.9965000 88.9972500 99.6670000 31.4100000 88.8240000 99.8860000Gas Comp 1R218 OCTAFLUOROPROPANE TUNGSTEN HEXAFLUORIDE PPM NITROGEN DIOXIDE NITROGEN