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It is reported on an analysis of electroproduction of light mesons at smallBjorken-x within the handbag approach. The partonic subprocesses, mesonelectroproduction off quarks or gluons, are calculated within the modifiedperturbative approach in which quark transverse momenta are retained. The softhadronic matrix elements, generalized parton distributions, are constructed bymeans of double distributions. The constraints from parton distributions andsum rules are taken into account. Various moments of these generalized partondistributions are compared to recent results from lattice gauge theories.

What did we learn about GPDs from hard exclusive electroproduction of mesons?