the three sets is approximately 1 without affecting the relative weights within each of these data sets that are provided by ALMA. The re-scaling is necessary as the absolute uncertainty of ALMA visibilities can be offset by a factor of a few, even after re-weighting the visibilities with the task <span style="font-variant:small-caps;">statwt</span> in CASA 4.7. These factors could be alternatively left as free parameters by adding an extra term to the likelihood function, however we find no differences in our results compared to leaving them fixed during multiple tries. Therefore we opt for leaving them fixed.

[lrl]{} Parameter & best fit value & description\
\
${M_\mathrm{d}}$ \[$M_{\earth}$\]& $0.250\pm0.004$ & total dust mass\
${r_{\min}}$ \[au\] & $46.6^{+1.4}_{-1.5}$ & disc inner radius\
${r_{\max}}$ \[au\] & $135.6^{+1.1}_{-1.2}$ & disc outer radius\
$\gamma_1$ & $2.6^{+0.3}_{-0.2}$ & inner edge’s slope\
$\gamma_2$ & $0.26^{+0.08}_{-0.10}$ & disc slope\
$\gamma_3$ & $-10.5^{+0.9}_{-1.0}$ & outer edge’s slope\
${r_\mathrm{g}}$ \[au\] & $75.5^{+1.1}_{-1.2}$ & radius of the gap\
${w_\mathrm{g}}$ \[au\] & $38.6^{+4.5}_{-3.6}$& FWHM of the gap\
${\delta_\mathrm{g}}$ & $0.52^{+0.03}_{-0.02}$ & fractional depth of the gap\
$h$ & $0.12^{+0.04}_{-0.05}$ & scale height\
PA \[$\degr$\] & $153\pm3$& disc PA\
$i$ \[$\degr$\]& $19.3\pm1.0$ & disc inclination from face-on\
${\alpha_\mathrm{mm}}$ & $2.57\pm0.11$& millimetre spectral index\
