tao) for sharing the freely 631 available data we used We also used time series of the Southern Oscillation Index 632 (http://www.cpc.ncep.noaa.gov/data/indices/soi) and of the This work was 634 supported by CNES in the frame of the Ocean Surface Topography Science Team program, 635 L. benefited from CNES funding and A. S. benefits from a PhD grant from the Institut de 636 ,
We thank the two reviewers for their useful 637 comments, p.638 ,
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