which combined ALMA and ATCA observations. The total flux in band 6 is consistent with that measured by [@Ricci2015] at similar wavelengths and using a more compact ALMA configuration, thus proving that our band 6 observations do not suffer from flux loss or miss large scale structure.

In order to study in more detail the disc radial structure, the top panel of Figure \[fig:radial\_profile\] shows the radial intensity profile, computed by azimuthally averaging the disc emission over ellipses as in [@Marino2016; @Marino2017etacorvi; @Marino201761vir]. Both in band 6 and 7, we find that the disc surface brightness peaks near the disc inner edge at $\sim45$ au, from which it decreases reaching a minimum at 80 au that is deeper in the band 7 profile likely due to the higher resolution. Beyond this minimum, the surface brightness increases until 120 au where it peaks and then decreases steeply with radius. No significant positive emission is recovered beyond 180 au. Within the gap, we find that the radial profile is not symmetric with respect to the minimum, with the outer section (80-100 au) having a steeper slope than the inner part (60-80 au), a feature that is present both in band 6 and 