2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41592Through an analysis of diffractive vector meson production, we show that the proton appears quite dense to a small size probe at present HERA energies. This means that saturation effects are already important.5 pages, 2 figures. Talk presented at the 10th International Workshop on Deep Inelastic Scattering, Cracow, 30 April-4 May 2002. To be published in Acta Physica Polonica BHigh Energy Physics - Phenomenologytext