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Rescaling of global histograms. Histograms of the background global subtracted intensities of PM (black circles) and MM (red circles) for a D. melanogaster chip. The dashed line is obtained by multiplying by a factor a, calculated as indicated in Eq. (5), the MM histogram. Note that the overlap of the solid and dashed curves is good except for high intensity values where saturation affects the signal in a significant way.
