University Potsdam, Nonlinear Dynamics Group, Am Neuen Palais 10, 14469 Potsdam, Germany. steuer@agnld.uni-potsdam.de|University Potsdam, Nonlinear Dynamics Group, Am Neuen Palais 10, 14469 Potsdam, Germany. steuer@agnld.uni-potsdam.de|University Potsdam, Nonlinear Dynamics Group, Am Neuen Palais 10, 14469 Potsdam, Germany. steuer@agnld.uni-potsdam.de|University Potsdam, Nonlinear Dynamics Group, Am Neuen Palais 10, 14469 Potsdam, Germany. steuer@agnld.uni-potsdam.de