### Combination of the Inclusive Diffractive Cross Sections at HERA.

Valentina Sola
A combination of the inclusive diffractive cross section measurements made by the H1 and ZEUS Collaborations at HERA is presented.~The analysis uses samples of diffractive deep-inelastic $ep$ scattering data at $\sqrt{s} = 318$ GeV where leading protons are detected by special spectrometers. Correlations of systematic uncertainties are taken into account by the combination method, resulting in improved precision.