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(Top) pre-treatment CT registered slices of sample R1 in dry state; (bottom) the corresponding registered post-treatment slices in dry state. The slices are at different distances to the front of the sample: (left) 1.6 mm, (middle) 10.7 mm, and (right) 27. The red and orange circles in top images identify large pores on the slices in pre-treatment condition. The red and orange circles in bottom images show that the large pores become smaller in post-treatment condition.