Top: original radial velocity data of TW Cam fitted with a Keplerian orbit folded on an orbital period of 655 d and eccentricity of 0.3. Middle: pulsations in the radial velocity folded on a period of 86.4 d. The red squares and the purple shaded region display the positions in the phase plot where the shocks occur. Bottom: pulsation cleaned orbit folded on a period of 654 d with an eccentricity of 0.2.