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Figure 5
Case study: ROI elemental intensity refinement. Subplots (a)–(c) show fitting results in three 25 × 25 sized regions of interest. Parameters are initialized to the values obtained from the integrated spectrum fitting and then refined together with elemental amplitudes. Spectra are shown as log10(counts+1) versus energy (keV). Gray denotes the experimental spectra, purple and pink are the NLopt and MapsTorch fits. Vertical colored markers indicate the characteristic lines of the fitted elements. MapsTorch consistently reduces residuals at weak lines (e.g. Al, S, Mn, Ni), resulting in higher-quality fits.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 1| January 2026| Pages 235-245
https://doi.org/10.1107/S160057752501032X
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