Phase-aligned pulse profiles observed in W2 by SiFAP2 (black points), Parkes (green line), and Fermi-LAT (magenta line; taken from 3PC catalogue, S23, and shifted assuming that the lag with the radio profile is the same as reported there). The normalisation of the radio and gamma-ray profiles is arbitrary. The reference epoch was set to align with the radio peak at phase 0.5. The blue line is a fit to the SiFAP2 pulse profile with four Gaussians added to a constant level.