Dependence of distributions on observational and methodological effects. Left: distribution of the average field of features identified assuming α = 1.5 in G-band images and B0 degraded with different PSFs (see legend). Middle: distribution of the average field of features identified assuming different α values (see legend) in both G-band and B0 images degraded with the indicated PSFs. Right: distribution of the average magnetic field of features identified assuming α = 1.5 in G-band images of 0.1′′ spatial sampling degraded assuming the indicated PSF, and B0 shifted in the x-direction (see legend).