  We utilize H1 and ZEUS data for exclusive electroproduction of photons,
$\rho^0$- and $\phi$-mesons to access generalized parton distributions at small
momentum fraction. To do so, we employ state-of-the art techniques, based on
next-to-leading order perturbation theory, flexible model parametrization, and
Bayesian inference. We provide a partonic interpretation of our analysis, where
emphasize is given to the transverse distribution of sea quarks and gluons.
