a) Radio light curves (data averaged over 1 d) vs. Φ_orbit, with Φ_orbit related to , with P₁ = 26.49 d and t₀ = JD2 443 366.775 (Gregory 2002), before (black) and after (green) (2 400 000.5 + 50 841)JD (see Appendix). b) Same as a) but for Φ_precession, related to P₂. c) Radio light curves vs. Φ_average for P_average = 26.70 d. The small window shows the simulated data (Eq. (2)) identically folded. d) Radio light curve vs. Φ_average with t₀ changed by Δt (Δt = 0 before (2 400 000.5 + 50 841)JD and Δt = 13.25 d after it, see Appendix). e) Sketch of the precessing jet in LS I +61°303 (out of scale).