Temporal profiles of REPIX for SML and ULW samples during Leg 2 juxtaposed with PAR. Note higher REPIX (calculated according to Eq. 4) in the SML than ULW during the first 3 hours of sampling, but the reverse at and after maximum PAR (in μmol m^–2 s^–1) was recorded around noon (UTC). DOI: https://doi.org/10.1525/elementa.278.f9