Fig. 1

image

Footprint (north up, east left) for ELAIS-N1 (top) Lockman Hole (middle) and Boötes (bottom) showing the coverage of multi-wavelength data from various surveys in optical and IR bands described in Sects. 2.22.4. The LOFAR radio coverage is also shown in black. The shaded light blue region shows the selected area of overlap that is used for the radio-optical cross-match in this paper for ELAIS-N1 (~7.15 deg2), Lockman Hole (~10.73 deg2) and Boötes (~9.5deg2), as described in Sects. 2.2.3, 2.3.3 and 2.4, respectively, with slightly reduced area after bright-star masking.

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