Peak frequency (calculated as the position of the maximum of f × PDS) as a function of observed luminosity (calculated using expression (36)) for i_obs = 0 (black circles), π/4 (red diamonds), and π/2 (blue triangles). Simulation runs 3LR (left) and 3LRoff (right). Error bars show flux dispersion within the time bin and the size of the frequency bin where the maximum was detected. Horizontal dotted green lines show spin frequency.