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Fig. 4

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Correlation between the Gaussian fit’s FWHM and the input veq sin i of the synthetic line profiles in the whole 0–50 km s−1 weq sin i (0–70 km s−1 FWHM) range. Upper panel: correlation between the FWHM and veq (black line) and the relative linear fit (blue dotted line), quadratic fit (orange dotted line), cubic fit (green dashed line), and fourth degree polynomial fit (red dashed line). Lower panel: residuals of the fits. The horizontal grey lines outline the 5% difference between the fit and the data.

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