  An updated determination is presented of the electric and magnetic form
factors of the proton, in the framework of a dual-model realization of QCD in
the limit of an infinite number of colors. Very good agreement with data is
obtained in the space-like region up to $ q^2 \simeq - \,30 \,{GeV}^2$. In
particular, the ratio $\mu_P \, G_E(q^2) / G_M(q^2)$ is predicted in very good
agreement with recoil polarization measurements from Jefferson Lab, up to $q^2
\simeq - 8.5 \,{GeV}^2$. \end{abstract}
