==== Species tree ====
Must be in [http://www.biomedcentral.com/1471-2105/10/356/ phyloXML] format ([http://forester.googlecode.com/files/species_tree_rio.xml example]).
-The species tree is allowed to have nodes with more than two descendents (polytomies) as long as the (slower) GSDIR ([GSDI GSDI] re-rooting) algorithm is used.
+The species tree is allowed to have nodes with more than two descendents (polytomies), as long as the (slower) GSDIR ([GSDI GSDI] re-rooting) algorithm is used.
=== Example ===