Fig. 2

(a) Distribution of log transformed expression level for all genes for reference dataset. (b) Distribution of mean log transformed expression level for genes with mean log transformed expression level above 3. (c) Standard deviations of log transformed gene expression level versus mean of log transformed expression level, for genes with mean expression level above 3. The color bands indicate quintiles of log expression levels from 0–20%, 20–40%, 40–60%, 60–80%, and 80–100%. The black line is the moving average of standard deviations, where each point on the line is the average for 1000 consecutive genes