Preliminary results of the 2013 Ibiza calibration campaign of Jason 2 and Saral altimeters. - Frédéric Frappart; Nicolas Roussel; Richard Biancale; Juan Jose Martinez-Benjamin; Félix Perosanz; Jose Garate Pasquin; Jose Martin Davila; Begoña Perez Gomez; Carlos Gracia Gomez; Rogelio Lopez Bravo; Ana Tapia Gomez; Ignasi Berenguer Valles Casanova; et al. (IGARSS, 2014)