Figure 4 depicts histograms of average background-corrected intensity values for an actual kinome array and its inter-array technical replicate. In this figure, the red curve is the estimated distribution of the average background-corrected intensity values [30]. Similar figures for the other template arrays and their replicates are given as Figures S4–S6. It is clear that the histograms for the actual array and its inter-array technical replicate are not unrealistically the same, and that they generally follow the same distribution as depicted by the estimated distribution of the data.