Figure 6. Distribution of number of links for each meta-gene. Shown is the neighborhood size (number of co-expression links) (X-axis, log base-10 scale) versus the number of meta-genes having that neighborhood size in the network (Y-axis, log base-10 scale). Blue diamonds show the result when 22,163 links are distributed randomly among the 3416 meta-genes. The brown line shows a regression line fit to the data giving a slope of –1.51, which specifies the Zipfian distribution that matches the data.