LOS velocity distribution of the magnetized supersonic downflows in He I loops (panel a) and filaments (panel b) and those for which the origin is not clear when considering the He Ic line core images (panel c). The contribution of the photospheric features to each of the chromospheric categories are shown. “N_sd” is the number of supersonic downflow profiles in each category. The numbers in red are the mean and standard deviations of the distributions, in km s⁻¹.