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Images of a 5 μg/ml solution of AlPCS where obtained as a function of exposure time constrained to a specified depth, and the integrated intensity normalized to the number of pixels is plotted as a function of exposure time for three depths of (▲) 0.072, (■) 0.1, and (◆) 0.127 cm (n=3, where the SD is smaller than the size of the point).
