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(a) Depth calculation process in a cluster (assume that the CRR on m3 is the minimum and the CRR on m1 is within rang range of the minimum CRR; the basic node (next-hop node) of s2 and s3 is f, and the basic node of s1 is s2, after their depth is already calculated); (b) 3D result of nodes’ depth adjusting.
