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Degradation hook plots referring to strongly and weakly degraded RNA taken from Archer et al. (2006) before [panel (a)] and after [panel (b)] correction using AffyRNADegradation. The height of the hook curve increases with increasing degradation level. Panel (c) shows the respective probe positional decays d(x) as plotted by the AffyRNADegradation package: the worse the RNA quality, the steeper is the respective decay
