Comparison of traditional versus time-decomposed spectroscopy for Flare F2 (M9 class, 2011 July 30). The blue lines are the data, orange lines are the thermal bremsstrahlung fits, and green lines are the cold thick-target fits. The pink regions in the residual plots indicate the energy fitting ranges. The gray line in the first panel is the background. The top panel shows traditional spectroscopy, and the bottom two panels show the results from the time-decomposed fits. The plots are annotated with 95% χ² parameter intervals. There are many MCMC samples overplotted to give a sense of model variation. The spurious counts in the thermal decomposition at high energies are nonphysical and are not included in the fit range. They arise because the background is slowly varying across time, like the thermal component.