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Following the presentation of the  XMM ‐Large Scale Structure ( XMM ‐LSS) survey X‐ray source detection package by Pacaud et al., we provide the source lists for the first surveyed 5.5 deg 2 . The catalogues pertain to the [0.5–2] and [2–10] keV bands and contain in total 3385 point‐like or extended sources above a detection likelihood of 15 in either band. The agreement with deep log  N – log  S  is excellent. The main parameters considered are position, count rate, source extent with associated likelihood values. A set of additional quantities such as astrometric corrections and fluxes are further calculated while errors on the position and count rate are deduced from simulations. We describe the construction of the band‐merged catalogue allowing rapid subsample selection and easy cross‐correlation with external multiwavelength catalogues. A small optical Canada–France–Hawaii Telescope Legacy Survey multiband subset of objects are associated with each source along with an X‐ray/optical overlay. We make the full X‐ray images available in FITS format. The data are available at the Centre de Données de Strasbourg and, in a more extended form, at the Milan  XMM ‐LSS survey data base.

The XMM ‐Large Scale Structure catalogue: X‐ray sources and associated optical data. Version I