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Fig. 3. STXM micrographs for an exterior aggregate region taken below (a) 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 from–log [I/Io] where I = ${Sigma}$ (281 eV – 282 eV) and Io = ${Sigma}$ (290 6 eV – 291.5 eV).