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Fig. 2. STXM micrographs for an interior aggregate region taken (a) below 281 eV and (b) above 290 eV the carbon absorption edge. Contrast in the C and mineral density is shown in the ratio micrographs (c) calculated fromlog [I/Io] where I =
(281 eV 282 eV) and Io =
(290.6 eV 291.5 eV).
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