Longitudinal distance histograms (left panel) of RHESSI flares with |λ_F| ≤ 60° from the HSB PFSS, for solar Cycle 23 and 24 combined. With brown, all the flares located in the northern hemisphere and with dark green all the southern flares. Cumulative distributions of these histograms (right panel), with additional cumulative distributions over-plotted that were produced from a set of flares with longitudes drawn from a random distribution (orange for northern and light green for southern).