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Tests with the TLE of [13C]S. platensis.

IPL purification.

Stable isotopic analysis of glycerol from ether lipids.

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Fig. S1. Molecular structures of major compounds mentioned in this work. The number in the parentheses indicates the number of rings (both cyclopentane and cyclohexane rings) in the molecule.

emi2888-sup-0002-si.doc70K

Table S1. Stable carbon isotopic values of biphytanes, sugars and glycerol, prepared from the lipid fraction of 2G-GDGTs. Except for a few single measurements, most results are the means and standard errors of duplicate or triplicate analyses.

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Table S2. Stable carbon isotopic values of sugars and glycerol of the 2G-GDGT fraction purified from a subsurface sample from the Peru Marin spiked or not spiked with the TLE of [99%-13C]S. platensis. Results are the means and standard errors of duplicate analyses.

emi2888-sup-0004-si.doc53K

Supporting information text.

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