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.
-==== Note ====
+==== Note about memory ====
Since the Java memory default allocation is too small for even moderately large data-sets, it is necessary to increase it with the `-Xmx2048m` command line option.