Top row: influence of scattered light on the maximum value of the derived Wilson depressions as a function of the strength of the mean magnetic field in the umbra at log τ = −0.9 (derived from the inversions without any additional scattered light). We consider both, the divergence method (left) and the pressure method (right, degraded to the spatial resolution of the divergence method). The blue squares show the Wilson depression of all spots in our sample without adding additional scattered light, the red circles highlight the spots for which we evaluate the influence of the scattered light. We also show the Wilson depressions derived from data with additional scattered light. We consider two different magnitudes of the scattered light, 1% (green triangles) and 2% (black diamonds). Bottom row: difference in the inferred Wilson depression Δz_W between the data without additional scattered light and with 1% (green triangles) or 2% (black diamonds) additional stray light.