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Through a determination of the $S$-matrix element for the scattering of alocalized colour dipole on a proton, we show that saturation effects canalready be sizable at HERA. The saturation scale is found to be around 1-1.5$GeV^2$ for the highest available energies and for central collisions, and is adecreasing function of the impact parameter.

DIPOLE-PROTON S-MATRIX DERIVED FROM DIFFRACTIVE MESON ELECTROPRODUCTION