2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41351A comparison of the H1 data on the longitudinal structure function, $F_L$, at small $x$ with the predictions from the generalized vector dominance / color dipole picture (GVD/CDP) is presented. Using the set of parameters previously determined in the fits to the total cross section, $σ_{γ^* p}$, we find good agreement with the data for $F_L$. Scaling in $η= (Q^2 + m^2_0) / Λ^2 (W^2)$ is discussed in detail for the longitudinal and transverse photoabsorption cross sections.9 pages, Latex 2e using epsfig, 3 figuresHigh Energy Physics - Phenomenologytext