²⁶Al mass for individual star clusters of given mass (dotted blue, right vertical scale) and cumulative ²⁶Al mass for the Milky Way as a function of star cluster mass, assuming a star formation rate of 1.9 M_⊙ yr^-1 (solid black, left vertical scale). Thin (thick) lines are for the case of truncated IMFs (random sampling). In the limit of high star cluster masses, 2.6 × 10^-8 M_⊙ of ²⁶Al is produced per unit stellar mass formed. The blue dashed curves are therefore linear, down to about 1000 M_⊙, where sampling effects become important.