Planetary mass versus semi-major axis and the eccentricity of the planetary orbit. The left panel includes the single planet systems while the right the multi-planetary systems. The colour of the points in both panels corresponds to the planetary eccentricity as defined in the legends. In the right panel, the colour of the edges of the points represents the planets within the same system and the points with no different colour at the edges corresponds to planets which are the only companions in their system that made it into the Ariel MSC. The dashed line marks the adopted mass limit to define a giant planet (see text for more details).