Relation of the diffuse emission to the magnetic field configuration. We illustrate the vertical cross section of the observed system along the direction that connects the two positive magnetic field concentrations from Fig. 4a. The magnetic field patches are marked with N for the northern polarity, and the spicular emission they host is shown in orange. The magnetic field lines form a canopy below the source region of the diffuse emission. The diffuse emission is shown in yellow. See Sect. 4.1.