Optical Balmer lines as predicted by Model 1 (blue), Model 2 (cyan), and Model 3 (red) at different phases of the V/R cycle. From left to right: V/R phases τ = 0., 0.25, 0.50, and 0.75; from top to bottom: plotted Hα, Hβ, Hγ, and Hδ. The vertical dotted line marks the rest velocity (v_rad = 0 km s^-1). The dashed curves are the observed profiles presented in Fig. 2 and are plotted here for comparison.