Inflow and outflow rates (top panel), SFR (second panel), rates of SNe type Ia and II (third panel), Galactic mass, M_⋆, enclosed in stars, and mass, M_gas, of the gas (bottom panel) as a function of galactic age, where t = 0 Gyr is the beginning of the Galactic formation and t = 14 Gyr is the present. The shaded areas with the corresponding colors represent the present-day measured values for each parameter (see Table 2). The inflow rate presented in the top panel includes the highMg (formation) and low-Mg (merger relaxation) phases, that are marked with red and black curves, while the rising accretion of the merger phase is marked with gray.