Josef Hanus, Charles University, Astronomical Institute, Prague, Czech Republic, Pierre Vernazza, Aix Marseille University, LAM, Marseille Cedex 03, France, Matti Viikinkoski, Tampere University of Technology, Department of Mathematics, Tampere, Finland, Marin Ferrais, Université de Liège, Liege, Belgium, Nicolas Rambaux, Sorbonne Université, Observatoire de Paris-IMCCE, Paris, France and the Harissa team