Fisher information map of the Coma cluster, with its corresponding mass density overlaid as a contour, for the central slice of thickness ∼5 h⁻¹ Mpc through a 3D region centered on the cluster that extends over 40 h⁻¹ Mpc. According to the Fisher information map, the central region containing the core of the cluster encodes fairly limited information gain, whilst the peripheral regions of the filaments and cluster core, where mass accretion occurs via gravitational infall, constitute the greatest proportion of information gain.