Posterior distributions of the surface brightness fits of the gas and dust distribution of the galaxies. Top left panel: [CII] emission of BRI1335-0417. Top right panel: Dust continuum emission of BRI1335-0417. Bottom left panel: [CII] emission of J081740. Bottom right panel: Dust continuum emission of J081740. All fits displayed have the Sérsic index fixed to 1.0, except for the dust distribution of BRI1335-0417 in which a free Sérsic index is preferred. We display the surface brightness at the effective radius in mJy/beam for the dust and mJy/beam km/s for the gas (I_e), the effective radius in kpc (R_eff), the galactic centre in pixels (x0, y0), the ellipticity (ϵ), and the position angle in degrees (PA). The best values shown are the median followed by the lower and upper errors defined by the 16th and 84th percentiles, respectively.