Line profiles of Hα and He I λ6678 for all observations (black) of V767 Cen, f Car, and 12 Vul. For each star, the red and yellow curves are taken near to the start of a flicker, being separated in time by the amount printed in the top panels (the red curve is the earlier of the two). The dashed vertical lines are the literature v sin i values, and the dotted lines are the integration limits for EW and EW_V/EW_R for Hα. The x axis for V767 Cen differs from the other two to better see the features of this low inclination system.