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A C B D Supplementary figure 5. Profiles of FFP and TEP concentration (A & C) and size (B & D) across the frontal zone. Contours display isopycnals. Maximal FFP concentrations were observed at the surface and bounded by the 𝜎𝜃 = 24.5 isopycnal of the oligotrophic waters. Maximum TEP concentrations were located between the 𝜎𝜃= 25 and 25.25 isopycnals in oligotrophic waters. FFP were larger in surface samples of the front and maintained large sizes in the mesotrophic stations. This trend was attenuated for TEP as maximum sizes were observed in the northernmost mesotrophic station, and sizes followed isopycnals.