Intensity contrast and magnetic field for the average supergranular outflow (left column) and inflow (right column): mean over five 8 h segments at the equator around the central meridian, averaged over one year. Bottom row: cuts along y = 0. The thin lines give the 1σ level of the variability, as computed from dividing one year of data into eight parts. The coordinates in all panels are given relative to the position of strongest horizontal outflow/inflow, measured with time-distance helioseismology. The x coordinate points west, and y is north. In all panels, the dashed circle has a radius of about 14 Mm.