Fourier parameters for 219 Cepheids in VELOCE as a function of log P up to the 7th harmonic. Some phase differences were shifted by ±2π for clarity. Errorbars are plotted for all stars but are usually smaller than the symbols. The number of harmonics fitted is color coded from light yellow (N_FS = 2) to dark red (N_FS = 10 is darkest shade for clarity). Overtone Cepheids are clearly apparent at low amplitudes and short periods. Excess dispersion in ϕ₅₁ and ϕ₆₁ near 1.0 ≲ log P ≲ 1.2 is a consequence of the well-known resonance between the fundamental mode and the second overtone (Simon & Lee 1981 ; Buchler et al. 1990; Antonello & Morelli 1996). These results are further illustrated in Appendix A.1.