Abstract
Acknowledgements. We wish to thank the anonymous referee for her/his con-structive comments, which have significantly improved the original manuscript. Based on observations made with the Gran Telescopio Canarias (GTC), installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, in the island of La Palma. This article is also based on observations made with the Nordic Optical Telescope (NOT) and the Liverpool Telescope (LT), operated on the island of La Palma by the Nordic Optical Telescope Scientific Association and the Liverpool John Moores University(with financial support from the UK Science and Technology Facilities Council),respectively, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. This research has been supported by the Spanish Department of Science and Innovation grant AYA2010-21741-C03-03 (Gravitational LENses and DArk MAtter−GLENDAMA project), and the University of Cantabria.
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