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tokens: We thank Arecibo for the generous amount of observing time for the completion of this project and the observatory staff for the successful completion of our observations. We also thank Richard Crutcher for his help in the analysis of our data. This work took part under the program ISM3D of the PSI2 project funded by the IDEX Paris-Saclay, ANR-11-IDEX-0003-02. This work was supported in part by the National Science Foundation under NSF grant AST 0908841. The Arecibo Observatory is operated by SRI International under a cooperative agreement with the National Science Foundation (AST-1100968), and in alliance with Ana G. Méndez-Universidad Metropolitana, and the Universities Space Research Association. Facility: Arecibo.