Spatial distribution of our detections in the W1 field, divided in four photometric redshift bins for the sake of clarity: top left z  < 0.35; top right: 0.35  < z  < 0.7; bottom left 0.7  < z  < 0.9; bottom right: z > 0.9. The symbols are large red circles: S/N ≥ 9; large green circles: S/N ≥ 6; medium blue circles: S/N ≥ 5; medium black circles: S/N ≥ 4; small black circles: S/N ≥ 3 and S/N ≥ 2. The area covered by the T0004 data release analysed by A10 is shown in magenta.