2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/136596A fit to world data on the photon-proton cross section sigma L+T and the unpolarised structure function F2 is presented. The 23-parameter ALLM model based on Reggeon and Pomeron exchange is used. Cross section data were reconstructed to avoid inconsistencies with respect to R of the published F2 data base. Parameter uncertainties and correlations are obtained.High Energy Physics - Phenomenologytext