Dependence of the maximum value of the Wilson depression z_W on various parameters of the studied sunspots. The blue circles represent the Wilson depression derived using the divergence method while the red squares depict the results from the pressure method. The solid lines indicate linear fits to the Wilson depressions. Also shown are the correlation coefficients between the Wilson depression the respective parameters of the sunspot as well as their 1σ confidence intervals. The correlation coefficients associated with the z_W derived with a given method are indicated by the corresponding color. We note that the Wilson depression inferred from the divergence method has an error of about 100 km resulting from uncertainties of the inversion. The various parameters of the sunspots are explained in more detail in the text.