Power spectra for the fluctuations in positional density from genomic elements in Arabidopsis chromosomes. Mean spectral densities for the fluctuations of each element within individual chromosomes were calculated, normalized, averaged over all 5 Arabidopsis chromosomes, and then plotted vs. frequency. The power spectra for all 6 genomic elements were qualitatively similar on this log-log plot: the most intense fluctuations were located at the low-frequency ends of the spectra. (a) Genes. (b) Indels. (c) SNPs. (d) Retrotransposons. (e) 180 bp repeats. (f) CCSs. (g) Simulated data from a Poisson distribution. (Insert) Mean Spectral Densities plotted with linear scales to emphasize the concentration of density fluctuations at low frequency.