Reference map, satellite image and photograph of a sea surface slick on February 11, 2016. Reference map (left) for TerraSAR-X stripmap intensity image (middle) acquired on February 11, 2016, at 23:49:10 UTC, with sampling sites 6 and 7 on February 12 (Table 1) denoted by red stars. The dark elongated area and surrounding dark areas in the middle of the SAR image show the slick accumulating at the convergence zone, while the lighter area in the south indicates rougher water. Bright spots in the image are oil rigs. In the photograph (right), the lighter area shows the slick on February 12, 2016, at 15:05:43 UTC in the SML sampling area. The area above the white line indicates the slick areas in the SAR image. The yellow rectangle contains the area of the possible oil spill. The green dot indicates where the photograph on the right was taken. DOI: https://doi.org/10.1525/elementa.268.f2