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Fig. 6
σresidual vs. S/N. Black solid line: we measured σresidual of the Arcturus HR13 spectrum for different values of artificially added noise σnoise2 = (S/N)-2. Red dots: LMC HR13 spectra. For Arcturus with artificial noise, σresidual ≃ 2 when S/N ≃ 55 while for our LMC spectra, σresidual ≃ 2 when S/N ≃ 40.
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