Maximum velocity at which significant variation is observed in the TVS (over all epochs) for each star, plotted against the oscillator strength times the wavelength. The maximum velocities are determined on the red and blue side of the features. We plot the absolute blue-side velocity for convenience. The blue velocities of the Paschen lines of B275 are not shown because they do not display variability at high velocities, which makes them indistinguishable from nebular subtraction residuals (which range from ~50–80 km s⁻¹).