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We present an updated impact parameter dependent saturation model (IPsat)determined trough a fit to the combined HERA I and I+II reduced cross sectiondata. The same HERA data are used to fit the linearized (IPnonsat) version ofthe applied dipole amplitude, which makes it possible to estimate the magnitudeof the saturation effects in various experiments. We find that bothparametrizations provide comparable descriptions of the considered data when aneffective confinement scale dynamics is incorporated with quark masses.Moreover, it is possible to consistently determine the light and charm quarkmasses. The role of potentially non-perturbatively large dipoles is examined indetail, with the result that, especially in case of the structure function$F_2$, their contribution is numerically significant. Potential to discriminatebetween the two models in future $e+p$ and $e+A$ experiments is alsoillustrated.

In depth analysis of the combined HERA data in the dipole models with and without saturation