Determination of the flow channels’ area from the inversion results. Left top: definition of fill factor f. Top right: flow channel at 90 deg to the LOS. The dashed vertical line denotes the FWHM determined by the code. d_eff1 denotes the effective size of the fc component. The parallel inclined arrows denote the orientation of the bg field. Middle row: same for LOS inclinations of the fc component of 60 and 120 deg. Bottom: another possible solution for the effective size d_eff2.