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. 2008 Dec 23;25(3):415–416. doi: 10.1093/bioinformatics/btn647

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© 2008 The Author(s)

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 1. — (a) MA-plot for an Agilent microarray. The M-values are not centered on zero meaning that there is a dependency between the intensities and the log-ratio. (b) Spatial distribution of the background of the green channel for an Illumina chip. There is an abnormal distribution of high intensities at the top border of the array. (c) Density plot of the log-intensities of an Affymetrix set of arrays (E-GEOD-349 ArrayExpress set). The density of one of the arrays is shifted on the x-axis. (d) Heatmap of the ArrayExpress Affymetrix data set E-GEOD-1571. Array 18 is an outlier.