Spectra in the range of the Ca ii lines for four well-known metal-poor stars. From top to bottom: UVES, UVES smoothed to ISIS resolution, ISIS spectra (black line), and the best medium-resolution fit (red line). Details of the calcium lines in the UVES spectra are included in the insets together with the effective temperature and metallicity derived with FERRE for UVES-smoothed and ISIS spectra.
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