Still image from supergranular temporal evolution movie at time lag Δt = 30 h. Top row: TD (inward–outward travel times) and LCT div_h for the average supergranular outflow, as shown in Figs. 5 and 6. Frames at time lags that are not multiples of eight hours were calculated using temporal Fourier interpolation. Bottom row: maximum and minimum travel time and LCT div_h over each average supergranule map as a function of time lag. The highest absolute value at the current time lag is marked with the black circle. This value is reflected by the limits of the colorbar in the top row panels. The full temporal evolution for both, the inflow and the outflow, can be found in the two movies attached to this figure.