The species tree is allowed to have nodes with more than two descendants (polytomies), as long as the (slower) GSDIR ([GSDI GSDI] re-rooting) algorithm is used.
-=== Example ===
+=== Examples ===
`rio gene_trees.nh species.xml outtable.tsv log.txt`
`rio gene_trees.nh species.xml outtable.tsv log.txt -r=outgroup -o=XVL1_ECOLI`