Figure S4. Sea-surface height in cm from Aviso (http://www.aviso.oceanobs.com) on the day of sampling for PE17-24 (large black triangle), June 26, 2017. The small black triangle indicates the position of the former Deepwater Horizon oil rig. This image was produced by NOAA/AOML (https://www.aoml.noaa.gov/phod/dhos/altimetry.php).