Fig. 3From: NANUQ: a method for inferring species networks from gene trees under the coalescent modelCycles in a level-1 quartet network are classified as type \(m_k\) if they have m edges and k descendants of the hybrid node. The only cycles possible in a level-1 quartet network are of (L) type \(2_1\), \(2_2\), and \(2_3\); (C) type \(3_1\) and \(3_2\); and (R) type \(4_1\). The dashed lines represent subgraphs that may contain other \(m_k\) cycles for \(m=2,3\)Back to article page