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- By CategoryMixed GasesGas Comp Amount37.5000000Gas Comp Amount178.9920000 81.0420000 77.8950000 99.9730000 99.9787500 99.9996000 90.8110000 90.4000000 69.6000000 90.0000000 50.0000000 79.4875000Gas Comp 1PPM METHANE PPM AMMONIA HELIUM NITROUS OXIDE NITROGEN