2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/197253We show that according to the present understanding of the energy evolution of the observables measured in deep-inelastic scattering, the photon-proton scattering amplitude has to exhibit geometric scaling at each impact parameter. We suggest a way to test it experimentally at HERA. A qualitative analysis based on published data is presented and discussed.9 pages, 2 figures. v2: references added, some points clarifiedHigh Energy Physics - Phenomenologytext