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Figure 4
Background intensity removal before tomographic reconstruction. Panel (a) is the raw projection image at a certain angle. Panel (b) is the same image after background removal. Panel (c) shows a comparison of the intensity profile over the line highlighted in panels (a) and (b). Although the sharp edge of the capillary wall is still visible, after capillary background removal, the intensity profile over the area without sample of interest becomes flat.

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