Spectra of V1723 Sco (left) and V6598 Sgr (right) during the optimal time period (see text). Only the best spectral model and its corresponding uncertainty was represented. Flux points with 1σ statistical uncertainties (black) and the quadratic sum of statistical and systematic uncertainties (red) are plotted when TS and N_pred > 2 and 95% upper limits otherwise. Energy bins from the analysis are merged only for the calculation of the flux points.