Standard deviations and correlations. Left box: Standard deviations (SD) summarizing variability in probe differences corresponding to the bias curves in Figure 3. The left column of points for each panel is for the low abundance probes, the right column of points is for the high abundance probes. A horizontal mark indicates the median SD for each column. Right box: Spearman's correlation values, r, assessing association of replicates. A horizontal line indicates the median r value for each panel. These data change little after normalization (data not shown). The descriptions for sections A – F within the boxes are the same as those described for Panels A – F in Figure 3.