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Figure 10
Performance of two separate models fitted to HERFD-XES slices in the XR-HERFD data evaluated across the entire range of incident energies Einc. The PCA model follows the functional form in equation (2)[link], employing the satellite (p1) and background (μ′) extracted using PCA in Section 5[link]. The aggregate model substitutes the relevant terms in equation (2)[link] with the satellite (Fig. 6) and background [Fig. 2(b)] we obtained by averaging over relevant HERFD-XES slices in Section 4[link]. The PCA model frequently outperforms the aggregate model, especially past Einc ≃ 7200 eV, yielding an average [\chi^{2}_{\rm r}] 25% lower than the aggregate model. This is a strong indicator that the PCA algorithm accurately captures the satellite structure.

IUCrJ
Volume 12| Part 5| September 2025| Pages 548-562
ISSN: 2052-2525
https://doi.org/10.1107/S2052252525005573