Figure 2.
Dependence of dispersion on the mean. Each dot corresponds to one counting bin in the data of Brooks et al. (2010) (discussed in detail in the Results section); (x-axis) normalized count, averaged over all samples; (y-axis) estimate of the dispersion. The bars at the bottom denote dispersion values outside the plotting range (in particular, those cases in which the sample dispersion is close to zero). (Solid red line) The regression line; (dashed lines) the 1-, 5-, 95-, and 99-percentiles of the χ2 distribution with 4 degrees of freedom scaled such that it has the fitted mean.
