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Figure 6
Large overview scan of a geological thin-section containing As-apatite with (a) the grayscale As concentration map and (b) the chemical phase map with the distribution of As(V) (green) and As(III) (red) with a 50:50 mixture (blue). The chemical phase map is derived from linear combination fitting of each single-pixel XANES with As(V) and As(III) references. The rectangular sub-region shows the area selected for further study (see Fig. 7[link]).

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