1. Nicolas Pinsard (corresponding author), University of Paris Sorbonne Paris Nord, CEPN (UMR 7234 – CNRS), 99 avenue Jean-Baptiste Clément, 93430 Villetaneuse, France.
2. Yamina Tadjeddine, University of Lorraine, BETA (UMR 7522 – CNRS), 13 place Carnot, CO n°26, 54035 Nancy, France.