Extended Data Fig. 1: The distributions of mass and [N/Fe] for the Li-rich stars and Li-normal stars.

The gray histogram indicate the Li-normal RGB stars or RC star (as noted in each panel) of which the evolutionary phases identified by Hon et al. 2017²⁸, the masses are from Yu et al. 2018⁶⁷, and the [N/Fe] are from ASPCAP³³. The bin size is as same as Fig. 3.