Observed (black dots) and best-fit synthetic (solid line) spectra of the three Boötes I stars around the Sr II 4215.5 Å line. The obtained [Fe/H] and [Sr/H] values are indicated in the bottom-left corner of each panel (“Name/[Fe/H]/[Sr/H]”). The dotted lines show the synthetic spectra fitted after changing the continuum levels by ± 1σSTDV (in each panel, the continuum levels have been shifted to match the best-fit value). For comparison, the spectrum of one halo giant, HD 107752, is shown in the bottom panel.
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