Evolution of the chemical composition (normalised to corresponding solar abundances) of He (solid), C (dotted), N (short dashed) and O (long dashed)in: ISM (top), massive star winds (middle) and GCR (bottom); the latter is the one calculated for the accelerated particles of MACC (Fig. 6) corrected to reproduce GCR source abundances today (as in Fig. 7). Dots in lower panel indicate estimated GCR source composition today, from Ellison et al. (1997).
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