1. Catalonia Institute for Energy Research (IREC); Jardins de les Dones de Negre 1 08930 Sant Adrià de Besòs (Barcelona) Spain
2. The Ångström Laboratory, Department of Engineering Sciences; Uppsala University; Box 534 Uppsala Sweden
3. IMRA Europe S.A.S.; 220 rue Albert Caquot F-06904 Sophia Antipolis France
4. IN2UB; Universitat de Barcelona; c. Martí i Franquès 1 08028 Barcelona Spain