Candidate remnant radio galaxies selected on the basis of different selection criteria (see Sect. 3). LOFAR radio contours (–3, 3, 5, 10, 15, 30, 50 × σ_local ≈ 0.5 mJy) of the highest resolution map 18 × 15 arcsec are overlaid on the FIRST map, whose scale is set in the range [3σ_local−S_peak]. The LOFAR beam is shown in the bottom left corner. The selection criterion used to identify the source is shown in the top right corner (M = morphology, CP = low core prominence, US = ultra-steep spectrum with size >40 arcsec).