Comparison of simultaneous 2018 Vega observations obtained with SOPHIE/OHP (left) and NARVAL/TBL (right). The two inner blue lines symmetric about zero velocity correspond to ±v sin i = 21.6 km s⁻¹ (the profiles have been recentred to the rest velocity), while the outer dashed blue lines include the zone where gaussian broadening widens the line profile. Only 80% of the highest S/N files were kept for the dynamical spectra. White signatures designate bright spots on the star, grey scale varies from −0.0002 (white) to +0.0002 (black), values outside this scale are saturated in the figure. Phase zero corresponds to BJD = 2456892.015.