2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40875Regge models for proton structure function with and without a hard Pomeron contribution are compared with all available data in the region $W>3$ GeV, $Q^{2}\leq 3000$ GeV$^{2}$ and $x<0.75$. It is shown that the data do not support a hard Pomeron term in $γ^{*} p$ amplitude. Moreover, the data support the idea that the soft Pomeron, either is a double pole with $α_{P}(0)=1$ in the angular momentum $j$-plane, or is a simple pole with $α_{P}(0)=1+ε$ where $ε\ll 1$.6 pages, LaTeX2e with elsart.sty, no figures. Talk given at the IX-th Blois Workshop on Elastic and Diffractive Scattering, Pruhonice near Prague, June, 2001, one reference is correctedHigh Energy Physics - Phenomenologytext