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Fig. 2

image

Comparison between the vrad measurements for the Hydra sample obtained using different synthetic spectra. The represents the difference between the vrad obtained when the Hydra spectra are cross-correlated with synthetic spectra for a RGB star and the Sun, respectively. The red line represents the mean value of and the standard deviation is presented using black dashed lines. Also, the typical error in vrad measurements for Hydra stars is shown using an error bar.

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