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- By CategoryMixed GasesGas Comp 3PPM METHANEGas Comp 2PPM 1,2,3,4 TETRAFLUORO BENZENE PPM SEC BUTYL MERCAPTAN 1,3 BUTADIENE PPB ETHANE AMMONIA R134A TETRAFLUOROETHANE PPM SULFUR HEXAFLUORIDE CARBON MONOXIDE 18 ETHYLENE
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