Supplementary information

From the following article

Phosphorus cycling in the North and South Atlantic Ocean subtropical gyres

Rhiannon L. Mather, Sarah E. Reynolds, George A. Wolff, Richard G. Williams, Sinhue Torres-Valdes, E. Malcolm S. Woodward, Angela Landolfi, Xi Pan, Richard Sanders & Eric P. Achterberg

Nature Geoscience 1, 439 - 443 (2008) Published online: 22 June 2008

doi:10.1038/ngeo232