Extended diffuse Lyα emission in the z = 3.07 overdensity (GID 2). Composite IUWT-S/N image formed with part of the MOSAIC 10 h depth exposure (bottom rotated square field), the UDF10 30 h depth exposure (small upper square) and the MXDF 140 h depth exposure (circle). The locations of the identified Lyα emitters are displayed as red circles with size proportional to the log of their luminosity. The blue circle at the bottom shows the location of the AGN and Lyα emitter blob. The 4 cMpc (1 pMpc) scale is shown. The inset displays the contours of the filaments in yellow, white and cyan for, respectively, the MOSAIC (only a fraction of the full field), MXDF and UDF-10 exposures.