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A large collection of results for the diffractive dissociation of virtualphotons, $\gamma^{\star}p \to Xp$, have been obtained with the H1 and ZEUSdetectors at HERA. Different experimental techniques have been used, byrequiring a large rapidity gap between $X$ and the outgoing proton, byanalyzing the mass distribution, $M_X$, of the hadronic final state, as well asby directly tagging the proton. A reasonable compatibility between thosetechniques and between H1 and ZEUS results have been observed. Some commonfundamental features in the measurements are also present in all data sets.They are detailed in this document. Diffractive PDFs can give a good account ofthose features. Ideas and results are discussed in the following.

Diffractive cross sections at HERA and diffractive PDFs