Institution: | School of Physics &Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD;Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE;Department of Physics, Nuclear &Astrophysics Laboratory, University of Oxford, Keble Road, Oxford OX1 3RH;Centro de Astrofisica da Universidade do Porto, R. das Estrelas s/n, 4150-762 Porto, Portugal |