Scatter of l-skewness versus l-kurtosis of gene expressions for the two Rosetta/Merck data sets - "Male" and "Female". The scatter is overlaid on the relationships between these moments for standard theoretical distributions. The legend for these distributions is provided in Figure 5. The l-skewness and l-kurtosis for the unaffected probe sets with mean log ratio of expression greater than 0.05 for the "Male" and "Female" datasets are plotted in the subplots (a) and (b) respectively. The intensity of red of each circle that represents a probe set in these subplots is made to vary linearly with the mean expression of this probe set. So higher the mean expression, the greater is the intensity of red.