Yellow arrows point to the same particular sample position as guide to the eyes. Using STXM, we measure full NEXAFS spectral region across Ti L2,3 absorption edge, with high spectral resolution, in this case better than 0.1 eV. Indeed, hyperspectral data can be obtained with large number of spectral points, while keeping a reasonable spatial resolution, adapting the scanning step-size at the beam spot-size of 30 nm. In this manner we isolated two specific spectral components (Figure ), marked with blue and red colors, assigned for surface and bulk signals, respectively. The corresponding R(G)B color-coded map presented in Figure was obtained using the SVD method implemented in the aXis2000 software after applying a drift correction to the recorded stack, similarly to the S-XPEEM datasets (Figure and). We applied a circular overlay of 2 µm diameter corresponding to the 2 µm diameter holes in the SiN support membrane. Thus, the 𝐼 0 signal was taken from the free space around the nanoparticles. Surface clusters (blue) and bulk nanoparticles (red) signals were isolated correspondingly (Figure ). They are similar to those obtained from the S-XPEEM (Figure ): increased A:B branching ratio for the surface component of S1 sample. NEXAFS spectra obtained by STXM exhibit two major additional features. First, Ti L 3 t 2g peak corresponding to the surface clusters (blue) is shifted by +0.1 eV. Second, the surface component (Figure ) presents an asymmetric B peak, that could not be evidenced using the S-XPEEM, because of the poorer spatial definition in that case. This asymmetry agrees with the pseudo-brookite character of the surface clusters, as suggested by S-XPEEM.