Dependence of the maximum wind velocity (dashed line) and total planetary mass-loss rate (solid line) at the Roche radius as a function of the velocity dispersion at the planet surface (note that the two vertical axes do not correspond). Results come from 1D simulations of atmospheric outflows induced by MHD waves. Ranges of values derived from the observations are highlighted as blue (Visit 2) and red (Visit 3) shaded areas, allowing an estimation of the required velocity dispersions and corresponding total mass loss.