Fig. 1From: Atmospheric Kelvin–Helmholtz billows captured by the MU radar, lidars and a fish-eye cameraPhotograph of the Shigaraki MU Observatory. The black dot and the vertical dashed line show the location and upward-looking direction of the fish-eye camera, respectively. The blue line shows the vertically pointing beam of the RRM lidar. The green line shows the MPL beam steered 30° off zenith toward northBack to article page