As Fig. B.2, but for the radial structure fit (blue; Sect. 5.5). The dashed black lines indicate the fixed values of α_in and α_out for the 5-parameter fit. The posterior for α_out is moderatley constrained; for α_in values ≲10 are strongly disfavored, but higher values follow the prior. We infer that the disk profile is steep, but the extent of the sharpness is hard to constrain. Notably, the r₀ value is somewhat higher for this fit, as discussed in detail in Sect. 5.5. The disk inclination value is also higher in this case, following the clear correlation of r₀ and i_tilt also highlighted in Fig. B.1.