Radial profiles of the gas disc scale heights in the sample of galaxies. The top panels are for the atomic gas discs in present-day Universe divided in bins of increasing stellar mass from left to right. The bottom left panel is for the molecular gas discs at z ≈ 0. The central and right panels in the bottom row are for gas discs, traced by either CO or [CII] emission lines, in high-z galaxies on the SFMS and the SBS, respectively.