Summary of our simulations on the atmospheric evolution of DS Tuc A b. Upper panel: cumulative percentage of the planetary mass loss evolution considering the X+EUV irradiation (dashed) or X-ray irradiation alone (dotted). We used the results obtained with the evolution by Penz et al. (2008). Horizontal solid lines represent the limits of the atmospheric mass concerning four representative cases with different starting masses, colour-coded as in the legend. Lower panel: radius evolution corresponding to the representative cases according to our models from the present age of the system to the end of the photo-evaporation phase.