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The shapes of the lungs separated only by a 3D erosion operator for the volumetric lung data of two examinations with lungs of different junction sizes: a lung data with a small medial junction; b the shapes of the left and right lungs separated by repeating an erosion process four times; c lung data with a large anterior junction; and d the shapes of the left and right lungs separated by repeating an erosion process 15 times
