Fig. 3: Results of single-spectrum sampling of the YBCO sample.

Legend at the bottom right corner applies to both sub-figures. a Convergence of RMS error with our comprehensive acquisition function and acquisition reweighting, and its comparison with cases (i) with comprehensive acquisition but without reweighting, (ii) with the posterior uncertainty-only acquisition function, (iii) with the upper confidence bound acquisition function, (iv) with the expected improvement acquisition function, and (v) with uniform sampling. The inset bar chart on the side shows the areas under the curve before the 50th measurement for each case with the same color coding to the RMS error curves. b Reconstructed spectra using these methods after 30 points are sampled (initial measurements included). The inset shows the magnified spectra within the energy range between 9002 and 9008 eV. This offers a direct comparison between the comprehensive acquisition method with and without reweighting, with the latter exhibiting larger errors in the plotted region.