OS-PVN populations. Ai, Cumulative histogram of complex angles for OS-PVNs with four summed von Mises distributions fit to the data (red curves); colored arrows represent populations centered at 16°, 86°, 141°, and 174°. Each population is defined by ±1.5× bandwidth of each distribution; dashed lines. Aii, Summed distribution of previously identified populations of OS-RGCs (red) and OS-PVNs (blue), area normalized to area of all populations. B, Cumulative histogram of preferred complex angles for OS-superficial cells. Scale bar, 20 μm.