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Changes in BIT, MBT, and CBT in the water column from lower Pearl River to the estuary for C-bGDGTs (A–C) and P-bGDGTs (A′–C′) for the sonication and Bligh and Dyer (BD) methods. Zero distance is arbitrarily set at PR-9 in Figure 1 and increasing distance is toward the estuary. The error bars in each panel represent SD of the average values between the surface water- and the bottom water samples in the estuary.
