Affiliation: | (1) Royal Observatory of Belgium, Avenue Circulaire-3-Ringlaan, 1180 Brussels, Belgium;(2) Department of Computer Science, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, U.K.;(3) Observatoire Astronomique de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France;(4) Department of Pure and Applied Physics, Queen's University of Belfast, University Road, Belfast, BT7 1NN, Northern Ireland, U.K. |