⟨|B_LOS|⟩ in dependence of distance to the AR centre for the 2018 April 22 SDO observations. We show the ⟨|B_LOS|⟩ inside the dark halo in blue calculated in two ways. The dashed line indicates the treatment where all pixels below the noise level have been set to zero, and the solid line displays the case where pixels below the noise levels have also been included. The shaded area indicates the range of these two calculations giving the maximum uncertainty range for the real unsigned magnetic flux density. The ⟨|B_LOS|⟩ for the QS is given in green.