Pareto Local Optimum Sets in the Biobjective Traveling Salesman Problem: An Experimental Study Luis Paquete, Marco Chiarandini and Thomas Stutzle¨ Darmstadt University of Technology, CS Department, Intellectics Group Alexanderstr. 10, 64283 Darmstadt, Germany lpaquete,machud,tom @intellektik.informatik.tu-darmstadt.de Abstract. 