Fig. 2
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Top: χ2 minimization as a function of v sin i for different oversampling factors. Bottom: residuals relative to the best-fit solution (oversampling factor = 9). The convolution kernel does not include any limb-darkening effect. The vertical line marks the target value v sin i = 8 km s−1, obtained from synthetic spectra with Teff = 3000 K.
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