Star formation rate in solar masses per year (magenta crosses), and total ²⁶Al mass in solar masses (green crosses) in the simulated galaxy as a function of galactic evolution time. Today’s values for the total ²⁶Al content in the Galaxy deduced from the INTEGRAL/SPI observations (2.8 ± 0.8 M_⊙, Diehl et al. 2006) are indicated by a (timeoffset) blue box, and estimates for the current star formation rate in the Galaxy (0.35−3.9 M_⊙ per year, Table 1 in Elia et al. 2022) are indicated by a (time-offset) red box. Note: the red box continues below the figure.