Comparison of the measured ²⁶Al activity in the analyzed samples 74 274 (blue points in panel A, from Fink et al. 1998) and 64 455 (red points in panel B, from Nishiizumi et al. 2009) with the values computed here using the final reconstructed spectrum (Table 2 in the main text) as shown by the solid black line (the mean activity) with the full-range uncertainty (gray area). The dashed curves with the hatched areas correspond to spectra reconstructed for individual samples (Table 1). The light blue hatched area with the olive curve depicts the GCR contribution to the activity.