Cumulative mass (upper panel) and metals (middle panel) ejected by massive stars (m >  8 M_⊙) and recycled in the simulation volume, at different times. The (red) empty stars refer to the adiabatic run; the (green) filled stars indicate the run with radiative cooling. The quantities computed using injection rates from Leitherer et al. (2014) are shown as dashed (black) lines in all panels, and would be recovered in the case of a closed system. In the lower panel, the total gas masses, normalized to the initial gas mass of the system, are shown as solid lines; SN ejecta, normalized to the corresponding quantities computed with Leitherer et al. (2014) mass return rate at each time are indicated as stars joined by dotted lines; these shown in the system at different times for the adiabatic (red lines and symbols) and radiative models (green lines and symbols).