Same as Fig. 4 but showing the line-to-continuum ratios for acetylene and water. Panel c: influence of the parameters covered in this work: black for C/O, red for O/H, green for gd, blue for q, and orange for h_C. MINDS observations are shown with gray squares, with fluxes exported from Grant et al. (2025). We include only T Tauri full disks, without cavities. This plot suggests that a C/O > 1 is excluded in T Tauri disks, and most of the disks are better reproduced by a high O/H or low C/O.