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Figure 6
Plots of the edge-jump magnitude versus the quality-of-fit parameter R-factor determined for each pixel (left), and corresponding cluster maps (right). In (a) the XANES of each pixel recorded for the sample introduced in Fig. 4[link] have been fit using only two XANES standards. It can be seen that a number of pixels show sufficiently high edge-jump values but poor (large) R-factors. After grouping these pixels (a, left) by drawing an area of interest in the plot, their distribution is highlighted within the FOV (a, right). These pixels cluster in the small area in the right upper corner, suggesting a third Fe phase present there. (b, left) The same plot as in (a) but using three standards; here the correlation between edge-jump magnitude and R-factor behaves as expected: a higher edge-jump value results in a lower R-factor (better fit) and vice versa. Pixels with R-factors > 0.02 are distributed in areas of low Fe concentration [b, right; compared with the edge-jump map in Fig. 4(b)[link]].

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 19| Part 2| January 2012| Pages 281-287
doi:10.1107/S0909049511049144
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