Figure 5.1: Top left: histogram of r1/g1 ,where r1 was drawn from a Normal distribution with mean 2000and standard deviation 50, and g1 from one with mean 1000.Top right: histogram of protect r2 / protect g2 ,where protect r2 was drawn from a Normal distribution withmean 200 and standard deviation 50, and g2 from one withmean 100. The histograms in the bottom row show the same data asthose in the upper row, but with log-ratios instead of ratios. Their distribution is less asymmetric.