In conclusion, the detailed analysis of discharge spots recorded by a high-speed camera reveals the shape and size distribution of these discharges in three dimensions. This is possible from two-dimensional images due to the electrode's curvature and the resulting viewing angle between the discharge and the camera. In general, the discharges have the shape of spheroids, which are mostly oblate (where the length perpendicular to the surface is smaller than the diameter parallel to the electrode surface). However, some prolate spheroids are also present.