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- By CategoryMixed GasesGas Comp Amount20.1220000Gas Comp 2SULFUR HEXAFLUORIDE CARBON MONOXIDE 18 PPM SEC BUTYL MERCAPTAN PPM TOLUENE PPM 1,2,3,4 TETRAFLUORO BENZENE PPM HYDROGEN CHLORIDE CARBON MONOXIDE PPM ETHANE PROPANE PPB BENZENE
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