Total unsigned magnetic flux of the quiet coronal hole regions per area (a), and magnetic flux imbalance of quiet coronal hole regions (b) vs. the mean magnetic field strength of the overall coronal holes. Unbalanced magnetic flux per area, which arises from quiet coronal hole regions vs. the mean magnetic field density of the coronal holes (c). Unbalanced magnetic flux per area, which arises from quiet coronal hole regions vs. the unbalanced magnetic flux per area, which arises from the long-lived magnetic elements (d). Panels c and d: unbalanced magnetic flux arising from the quiet coronal hole regions was split into the magnetic flux, which arises from a background magnetic field (black) and from unresolved magnetic elements (orange). The shaded areas give the 1σ uncertainties of the corresponding fits.