24 × 24 arcmin² OSIRIS mosaic (north up, east left) of the studied region of the Lockman-Hole field with equatorial coordinates (J2000) 10^h52^m43^s +57°28′48″ at the centre. Objects from the Lockman-SpReSO project input catalogue are highlighted on the mosaic: the blue squares represent objects in the faint subset, the yellow stars are objects in the bright subset, the green circles are objects in both sub-samples, and the red triangles are objects in the catalogue that were left unobserved.