Top panel: an observed SOT/SP magnetogram (vertical field component B_z) of a quiet-Sun region studied here. White/black denotes positive/negative magnetic field concentrations. Bottom panel: inferred magnetic connectivity of the region, showing the vertical magnetic field component in grayscale with the contours bounding the identified magnetic partitions. The flux-tube connections identified by the magnetic connectivity matrix are represented by line segments connecting the flux-weighted centroids of the respective pair of partitions. Red, blue, yellow, and cyan segments denote magnetic flux contents within the ranges [10¹⁶, 10¹⁷] Mx, [10¹⁷, 10¹⁸] Mx, [10¹⁸, 10¹⁹] Mx, and >10¹⁹ Mx, respectively. Only connections closing within the field-of-view are shown.