Atmospheric temperature (left Y-axis, solid lines) and bulk outflow velocity (right Y-axis, dashed lines) against radial distance normalised to the Roche radii of the planets, as predicted by CHAIN models. The top panel shows results for the H/He atmospheres and the bottom panel for H₂O atmospheres. The different colours correspond to planets b (blue), c (orange), and d (green). The crosses denote the positions of sonic points.