Mean values of the magnetic field inclination (A), the magnetic field strength (B), and the vertical component of the magnetic field (C) for every identified boundary as a function of the area encircled by the given boundary. The uncertainties represent the standard deviations of the physical parameters at the boundaries. Contours encircling areas smaller than 10 Mm² marked in red are not considered for the statistical analyses. The dashed line corresponds to the most probable value estimated by a Bayesian linear regression, and the shaded area denotes the 99% confidence interval of the estimated model.