Perseus-Pisces supercluster region in the SLOW simulation with the cross-identified counterparts: 1: Perseus (A426), 2: AWM 7, 3: UGC2562, 4: 3C129, 5: A262, 6: CIZAJ0300.7+4427, 7: NGC507, 8: UGC3355. The white contours show the 2D gas overdensity levels of $[1.25,20]\ast {\overline{\rho }}_{\mathrm{image}}$. The gas density was computed in a spherical shell of 54 Mpc/h thickness centered on the main cluster. Top right: Same region as viewed by ROSAT. Bottom left: Supercluster core region according to the Clairvoyant N-Body forward simulation in the initial conditions (z = 120). Bottom right: Collapse region (red) and its environment at z = 0.