Some examples of extended sources in the data release published with this paper. From top-left to bottom-right, the nearby galaxies M101, M51, M106, the galaxy cluster Abell 1550, the emission surrounding the early type galaxy MCG+10-18-009, and the complex blend of emission coming from both AGN activity and diffuse sources in the ICM in Abell 1314. Contours start at three times the local rms noise. In the last panel, the green dashed lines show the gaussians used by the source finder to model the brightness distribution of the radio sources, the blue regions show the location and size of the sources, composed by one or more Gaussian components, as they are present in the catalogue.