Ratios of [hs/ls] (top panel, where ls is the average of Sr, Y, and Zr, and hs the average of La and Ce) and [r/Fe] (bottom panel, where “r” stands for the average of the [Sm/Fe] and [Eu/Fe] ratios) are shown as a function of [Zr/Nb]. The four N-rich barium stars are shown as open blue squares, of which HD 100503 is found to be highly enriched in r-process elements.
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