Open triangles and open circles represent the median (1−R) obtained for a low-mass galaxy sample (9.5 < log (M⋆) < 10) and high-mass sample (11 < log (M⋆) < 11.5), respectively. The green curves correspond to the mass loss parametrized by Conroy & Wechsler (2009) assuming the same redshift of formation z = 10 for all the stars. The black line is the parametrization that we adopt as a lower limit for the return fraction.