  The skewing factor, defined as the ratio of the imaginary parts of the
amplitudes $Im A(\gamma^* p \to \gamma^* p)/Im A(\gamma^* p \to \gamma p)$ is
extracted for the first time from the data using recent Deeply Virtual Compton
Scattering (DVCS) and the inclusive inelastic cross section measurements at
DESY-HERA. The results values are compared to theoretical predictions for NLO
QCD and the colour dipole approach.
