LH (top), Boo (middle) and EN1 (bottom) fields targeted by LOFAR at 150 MHz. Light colors refer to the raw catalogs, cut at a distance from the pointing center of 0.3 of the LOFAR 150 MHz primary beam power. Darker colors refer to the final catalogs. The varying shape of their footprints highlights the regions with available optical/IR data. The areas of the optical/IR footprints are listed in Table 1.