Institution: | Institute de Astronomía y Geodesia (CSIC-UCM), 28040 Madrid, Spain;Goddard Space Flight Center/NASA, Greenbelt, MD 20771, USA;Geodetic Institute, Statens Kartverk, 3500 Hønefoss, Norway;Laboratorio de Astrofisica Espacial y Fisica Fundamental (INTA-CSIC), Villafranca del Castillo, Madrid, Spain |