Example of the three images presented to citizen scientists for one catalogued LOFAR radio source (ILTJ093236.46+602825.5). Left panel, the default view: radio contours from the LOFAR data (logarithmically increasing by a factor two at each interval from five times the local noise level) are superposed on the Legacy three-colour image. Cyan ellipses denote catalogued radio sources, with sizing as described in the text; the solid ellipse is the one under study and dotted ellipses represent other sources in the radio catalogue. Middle panel: the colour scale shows the LOFAR radio data only. Right panel: a view of the optical sky only. This image is 2 arcmin on a side.