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. 2014 Oct 27;111(47):16654–16661. doi: 10.1073/pnas.1418778111

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Fig. 1. — Map of study locations. (A) The southwest Pacific, where KM0703 SPEEDO Station 19 (20°S, 170°W) is indicated in red and the hydrothermally active Tonga–Kermadec Arc is indicated as a topographic high along 175°W. (B) The southeast Pacific, where Melville BiG RAPA Stations 7 (26.25°S, 104°W) and 4 (23.5°S, 88.75°W) are indicated in red and the hydrothermally active EPR is designated. Shown as squares are stations of historical ³He data that were used to interpolate the average ³He profiles onto this study's sampling locations (historic ³He data from cchdo.ucsd.edu); the more proximal stations had a greater influence on the interpolated ³He profile than the distal stations. Shown as crosses are sites of confirmed or inferred hydrothermal venting deeper than 1,000 m (33). Directions of mean advection at 2,000 m (36) are indicated with black arrows.