Two Hα line profiles taken about 15 hours apart for one of our targets, V767 Cen, in black and gray (with corresponding EW_V/EW_R values printed) to illustrate the procedure for measuring EW_V/EW_R from Eq. (1). A constant, C = 1 is first added to the data. The outer integration limits are set at ∓250 km s⁻¹ for ν₁ and ν₂. In the top panel, the inner integration limits, c₁ and c₂, are set at 0 km s⁻¹ so that the full line profile is used. In the bottom panel, c₁ and c₂ are set at ∓v sin i (106 km s⁻¹) so that only the wings are used in the calculation.