Boxplots can be used to visualize overall experimental quality before expression data normalization

Copyright information:Taken from "BarleyBase—an expression profiling database for plant genomics"Nucleic Acids Research 2004 ;33(Database Issue):D614-D618.Published online 17 Dec 2004 PMCID:PMC540077.Copyright © 2005 Oxford University Press The central box shows the middle 50% of the data. The dotted lines or whiskers, extend to the 10th and 90th percentiles, respectively. The circles represent outliers. Boxes with the same color are technical replicates with the same treatment factors. These data summarize the logarithm of the raw probe set perfect match (PM) expression values in experiment BB4 before normalization.