Fig. 1
Comparison between the FEROS spectrum taken on June 29, 2002 (black line), the UVES spectrum taken on July 10, 2001 (red line) and the X-shooter spectrum taken on June 2, 2014 (blue line). The He i 4471 and the Mg ii 4481 lines are shown as effective temperature diagnostic, the N ii lines between 4600 and 4625 Å as nitrogen content indicator, and the Hα line for the stellar wind variations.
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