Left: current-day distribution of exoplanets in the diagram. Black circles show planets for which values of M_∗, R_∗ and stellar ages T_∗ are available. Gray circles show those bodies for which stellar data is missing. Right: reconstructed original distribution assuming backward orbital evolution from stellar tides for the age of each parent star. In both plots, the dashed curves show the lower limit to normalized semimajor axis, as a function of the planetary mass, obtained from the hydrodynamical simulations and scaled along the y-axis to fit the exoplanets.