Cuts along the central axis of the ensemble averages of the different types of features in AR 10923 shown in Fig. 3 for various observables. For the CUDs, we performed an azimuthal average. Panel A: continuum intensity. Panel B: vertical magnetic field. Panel C: inclination of the magnetic field. Panel D: line-of-sight velocity. The colored symbols indicate the following features: CUDs (orange), short PUDs (purple), long PUDs (blue), penumbral filaments in the inner penumbra (red), and penumbral filaments in the outer penumbra (green). The shaded areas indicate the 1σ error of the mean.