Comparison between empirical values for RV precision δvrms and its constituents S/N and c∕Q. Top panel: normalized S/N from individual spectra of GX And (M1), Luyten’s star (M3.5), and Teegarden’s star (M7). Middle panel: cumulative spectroscopic information c∕Q calculated from coadded spectra of the three example stars. Bottom panel: ratio between c∕Q and S/N (filled circles) together with empirical values of δvrms (open stars, see Fig. 6).
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