Best fits to the data from Bands 3, 4, 7, and 9 using two free-free emission models (sum the dusty disc component from Sect. 3.2 and the free-free component from Sect. 3.3). The first has a fixed α = 10⁻², shown as the solid orange line and has a minimum reduced χ² of 3.18. We find that the best fit parameters of this model are $\log ({\dot{M}}_{\mathrm{p}}/(M_{\mathrm{J}\mathrm{u}\mathrm{p}}/\mathrm{y}\mathrm{r}))=-{3.48}_{-0.09}^{+0.06}$ at 1 σ, with a strict upper limit on the dust-to-gas ratio of log(ζ) = −4.80. The second has a fixed Ṁ_p = 10⁻⁶ M_Jup yr⁻¹ as the solid light grey line and has a minimum reduced χ² of 2.54. We find that the best fit parameters for this model are $\log (\alpha )=-{6.86}_{-0.07}^{+0.08}$ at 1 σ, with a strict upper limit on the dust-to-gas ratio of log(ζ) = −7.05.