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Figure 1
(a) Raw radiograph of a cast iron sample with rectangular cross section where the previous inhomogeneities are clearly observed and should be erased by a flat-field normalization provided this background remains temporally steady. (b) Flat-field, signature of the beam inhomogeneity. (c) A flat-field difference in the rectangle drawn in (b) showing a moving particle. The color scale for this residual is expressed in proportion to the flat-field amplitude to provide an order of magnitude.

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