Radial profiles of surface density (a), temperature (b), gas and radiation pressures (c), and aspect ratio of the β LyræA disc for a modified Shakura-Sunyaev model, which is gas-pressure-dominated and has Kramers’ opacity. The midplane temperatures and surface densities are significantly higher than the observed values. This also generates significantly higher pressure profiles. The observed aspect ratio is reached in hydrostatic equilibrium.