Standard deviations between observed and random for all genomes. a) Clustering coefficient b) Path length c) Density. Plots show for each genome (x-axis) the number of standard deviations (based on 1000 randomisations of each graph while preserving scale free topology) between the observed and expected values (y-axis). For example, a bar that stops at -3 indicates the observed value was three standard deviations below the randomly expected value. Positive values are shown in blue, negative in green. Genomes have been grouped by kingdom as indicated by the red, yellow and blue regions below the x-axis. The black region marks the graphs that are combinations of genomes in the following order: all genomes, archaea, bacteria, eukaryotes, multicellular eukaryotes and unicellular eukaryotes. The mean degree was excluded from this analysis because it was intentionally fixed for the randomisation experiments.