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Image: Fluorescence micrograph of the end of the capillary after lysozyme has been allowed to diffuse for 1,000 s. A scale bar of 75 μm is shown. Plot: the intensity (O), as read from the image, for a line along the axis of the capillary, starting at the maximum intensity and moving to the right; a sum of two Gaussians (—), with the equation as given in red in the figure.
