Two-dimensional histogram of observed angles, α_y, obs, observed by PAS from 7 July 2020 to 30 November 2023 over the determined inflow direction, φ_sw, obs (valid data with a quality factor of 0 only). Each column of the 2D histogram in panel b) is normalised to its respective maximum. The bins have a fixed size of 0.1° ×0.1°. 1D histograms of the observed angles, α_y, out, (Panel a) and the determined inflow directions. φ_sw, out, (Panel c) are based on the same bin size, respectively. In addition, panel b) includes results from VPAS. For input angles α_in ∈ {1, 3, 5, 7, 9, 11, 13, 15, 17, 19}° (horizontal dashed lines), the resulting output angles α_y, out are given with solid lines in the same colour. 99.89% of all N_total = 15 476 959 valid data with a quality factor of 0 are shown here, the remaining 0.11% have α_y, obs > 20°.