System.out.println();
System.out.println( " Options" );
System.out.println( " -" + GT_FIRST + "=<first> : first gene tree to analyze (0-based index)" );
System.out.println( " -" + GT_LAST + "=<last> : last gene tree to analyze (0-based index)" );
System.out.println( " -" + REROOTING_OPT
System.out.println();
System.out.println( " Options" );
System.out.println( " -" + GT_FIRST + "=<first> : first gene tree to analyze (0-based index)" );
System.out.println( " -" + GT_LAST + "=<last> : last gene tree to analyze (0-based index)" );
System.out.println( " -" + REROOTING_OPT