Visibility profile of dust+ff core 2 in HMC G9.62+0.19. The profile of the non-core-subtracted and core-subtracted data is shown in gray and black, respectively (further explained in Sect. 6.1). Two power-law profiles, tracing roughly the clump and core scales, are fitted to the core-subtracted data, shown in red and green, respectively. The bottom axis shows the uv distance in k_λ, and the top axis is the corresponding spatial scale. The dashed purple line indicates the source diameter (Table C.1). The figures for the remaining sources are shown in Fig. C.2.