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- By CategoryMixed GasesGas Comp Amount250.0000000Gas Comp Amount1100.0000000Gas Comp 2PPM ISOPENTANE PPM ACETYLENE PPB FORMALDEHYDE PPM SEC BUTYL MERCAPTAN CARBON DIOXIDE PPB CYCLOPENTANE N PENTANE PPM AMMONIA NITROGEN DIOXIDE PPM TERTIARY BUTYL MERCAPTAN