In seeking to improve QCD modeling of hadron physics, we have determined the amount of infrared enhancement, above that exhibited by the gluon two-point function, necessary to correlate quenched-lattice QCD data for the dressed-quark propagator and the dressed gluon propagator via the rainbow gap equation. The solution of this gap equation is used as input for a model of the dressed quark-gluon vertex at zero gluon momentum, formed from a non-perturbative extension of the two Feynman diagrams that contribute at one loop in perturbation theory. Comparison is made with recent quenched-lattice QCD data. Possible implications for hadron physics are discussed.
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