Dynamical spectra of MWC 656 shown over two orbital cycles. From left to right, the panels display the HeI [[INLINE31]], HeI [[INLINE32]], and HeII [[INLINE33]] lines. Two epoch spectra near quadrature phases are overplotted in black to further illustrate line profile variations. The orbital RV curves of the Be star (pink) and the companion (white), derived from the best-fit orbit model, are overlaid and trace the associated absorption and emission features.