Radial profiles of the disc sample based on the analysis in the image (black line) and visibility plane (grey line). The snowline estimates of H₂O, CO₂, CH₄, and CO are indicated by the coloured areas. The minimum distance from the star that can be imaged, based on half the beam radius, is indicated by the hatched area. The R_gap , or the location of the innermost detected local minimum, is indicated by the vertical dotted line. The discs are organised from strongest ${\text{H}}_2\text{O}/L_{\text{acc}}^{0.6}$ (top left) to weakest (bottom right), with the two (pre-)transition discs in the bottom row.