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(Left) pre-treatment CT dry slice (a) and wet slice (b) of sample R1 before registration, and the corresponding registered dry (a′) and wet (b′) slices. (Right) post-treatment CT dry slice (c) and wet slice (d) after registration, and the corresponding registered dry (c′) and wet (d′) slices. The slices were chosen at 1.2 mm to the front of the sample. The red ovals show the features used in image registration.