2D overdensity maps of the LBGs and of the spectroscopically selected galaxies found to be clustered with the QSO. Left panel: Overdensity map of the LBGs identified within the 24 × 24 cMpc² FORS2 FoV. The amplitude of the overdensity is shown in shades of blue scaling with the colormap. Contours are shown for $\rho /\overline{\rho }=2.5,2.0,1.5,1.0$ as solid, dash-dotted, dashed and dotted lines respectively. The central QSO is marked as a red star, and the MUSE FoV is also displayed on top of the FORS2 R-band image. Right panel: zoom in the FoV of the MUSE mosaic, with the white-light image overlaid by the overdensity map of the spectroscopic sample of galaxies identified within |Δv|≤1000 km s⁻¹ (gray stars) around the QSO (red star). Solid, dash-dotted, dashed and dotted contours correspond to $\rho /\overline{\rho }=100,50,10,1$. Note the different spatial scaling and that of the colormap in the two panels. North is up.