(Left) Brightness profiles reconstructed with frank’s “Normal” method using different α and w_smooth values. We get a dip and a peak resembling substructures, which are labelled as D86 and B96 respectively. These are shown with dotted and solid lines. (Right) Brightness profiles reconstructed with frank’s “logNormal” method using the same α and w_smooth values as the plot on the left. We get a shoulder-like emission between 80 au and 97 au. The extent of the shoulder is shown with dotted lines. The intensity axis is cut off at the rms of the 0.65 mm observation (0.14 mJy arcsec⁻²).