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- By CategoryMixed GasesGas Comp 3PPM ISOBUTANEGas Comp Amount199.9989000 99.9848000 99.9969000 99.9972000 99.8200000 99.9750000 99.9830000 93.2000000 99.9899000Gas Comp 1PPM HYDROGEN SULFIDE NITROGEN DIOXIDE NITROGEN NITRIC OXIDE PPM CHLORINE