Evolution of Li abundance (top) and relative contributions (by mass) of different Li sources (bottom) as a function of [Fe/H]. In the top panel, the evolution of total abundance is shown in black, and the solar symbols indicate the solar meteoritic values for ⁶Li and ⁷Li. The other curves (in both panels) show the components from the BBN, novae, and GCR (two curves for GCR show components both for ⁶Li and ⁷Li). In the bottom panel, the solar symbols indicate the contributions at solar metallicity.