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. 2021 Jul 29;21:148. doi: 10.1186/s12862-021-01878-7

Fig. 4.

Fig. 4

P-value histogram of (A) host–coronavirus and (B) host–paramyxovirus relationships. The optimal reconciliation cost of the coevolution trees is indicated with a red line, and the optimal cost of the same trees constructed with tip associations permuted at random is shown in blue columns