Additional file 4.

Residual standard deviation against minimum expression intensity. For each pre-processing method, standard deviation of the residuals observed for the regression fitted to the expression intensities are plotted against minimum expression intensity of each probe. The blue line represents a loess-curve fitted to the values.

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Schmid et al. BMC Genomics 2010 11:349   doi:10.1186/1471-2164-11-349