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Roy-Barman, M. Freydier, R. van Beek, P. Souhaut, M. Jeandel, C. IPEV (Institut Paul Emile Victor); INSU/CNRS; LEGOS (Toulouse); CNRS-INSU We thank the captain and crew of the R/V Marion Dufresne, the PI of KEOPS project Stephane Blain and the chief scientist Bernard Queguiner. We would like to thank Lionel Scouarnec and Christophe Guillerm (INSU) for their help with the in-situ pumps. We are grateful to Jean-Louis Reyss who enabled us to achieve the gamma measurements at LSM. We are especially thankful to Roger Francois and Walter Geibert for providing the Pa spikes allowing us to achieve this study. We thank Catherine Pradoux for her help in the clean laboratory. We are very grateful to the two anonymous reviewers for their critical and fruitful comments. This work was supported by the IPEV (Institut Paul Emile Victor), the INSU/CNRS and the LEGOS (Toulouse).The publication of this article is financed by CNRS-INSU. 0 COPERNICUS GESELLSCHAFT MBH GOTTINGEN BIOGEOSCIENCES
