  The scaling in $\sigma_{\gamma^*p}$ cross sections (for $Q^2/W^2 << 1$) in
terms of the scaling variable $\eta = (Q^2 + m^2_0)/\Lambda^2 (W^2)$ is
interpreted in the generalized vector dominance/color-dipole picture (GVD/CDP).
The quantity $\Lambda^2 (W^2)$ is identified as the average gluon transverse
momentum absorbed by the $q \bar q$ state, $<\vec l^{~2}> = (1/6) \Lambda^2
(W^2)$. At any $Q^2$, for $W^2 \to \infty$,the cross sections for virtual and
real photons became universal, $\sigma_{\gamma^*p}(W^2,Q^2)/\sigma_{\gamma
p}(W^2) \to 1$.
