χ2 map for the three lines of interest. Fe i 15 648.5 Å (top), Fe i 15 622 Å and Fe i 15 662 Å (bottom) for YLW 19 are shown. The small white rectangle indicates the minimum χ2 and the white crosses indicate values within 1σ from the minimum and within the 1σ limits on v sin i indicated by the horizontal red lines.
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