Changes in spectra for N-copy mutants. Effects of N-copy mutations in E and P on signal features in the Fourier spectrum for oscillators: A. E of Eq. 7, B. P of Eq. 8, C. Q of Eq. 8. On the horizontal axis, f stands for features: 1 is period, 2 is offset (analogous to H(p = 0) in Figure 2), 3 is amplitude, 4,5,6 are the first, second, and third harmonics. On the vertical axis, relative change is the ratio of feature strength in the mutant to wildtype. Marker sizes represent N from 1 (large) to 5 (small).