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} <br /> cn <br /> z <br /> 100 co <br /> H <br /> W <br /> W <br /> F-d <br /> H <br /> Wd <br /> G� <br /> HC NOX <br /> HC <br /> NOX CO <br /> 0 <br /> 14 16 18 20 22 24 <br /> A/F Ratio (wt/wt) <br /> FIGURE 1. TYPICAL EFFECT OF AIR TO FUEL RATIO ON EXHAUST GAS EMISSION LEVELS <br /> C/30 <br />