We generalize our previous model for \gamma ^* p scattering to \gamma \gamma scattering. Performing a new simultaneous fit to \gamma ^* p and \gamma \gamma total cross section we find an optimal set of parameters to describe both processes. We propose new measures of factorization-breaking for \gamma ^* \gamma ^* collisions and present results for our new model.

PACS numbers: 13.60.Hb, 13.85.Lg