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Figure F17. SEM photomicrographs with corresponding EDS spectra and quantitative analysis showing (A) filamentous iron and (B, C) iron oxides, possibly of biotic origin. All photomicrographs are from the original Section 331-C0017C-1H-7 before the enrichment experiments for that sample were carried out. The red circle indicates the location where the EDS spectrum was taken. cps = counts per second.

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