Boxplots of raw and pre-processed miRNA microarray data.

Upper part left: boxplot of the raw log₂ intensities of Febit miRNA arrays, upper part right: boxplot of the raw log₂ intensities of Affymetrix miRNA arrays, lower part left: VSN normalized Febit miRNA array data, and lower part right: VSN normalized Affymetrix miRNA array data. X-axis shows sample names, Y-axis is in log₂ arbitrary units. The black bar represents the median of each distribution. The open circles represent the outliers.