Relative angles ΔPA = |PA_rad − PA_opt| between the radio and ionised gas axes measured in the eight QSO2 indicated in this plot (see text). They have been grouped in three bins according to ΔPA < 10°, 10° ≤ΔPA < 20° and 20 ≤ ΔPA < 30°. For each object, the number of radio-Hα angles in that specific bin is shown in brackets. The radio and gas axes are in general very closely aligned. For seven objects (first bin), the axes are identical or almost identical (ΔPA < 10°) at least on one side of the AGN.