Overview of the SOL2021-10-09 flare and the Gaussian decomposition of its 20−25 keV HXR non-thermal time profile. The fit gives a standard deviation of the residual σ_R = 0.62. This is a strong fit. The noise level on the measured values of the counts is higher for this flare since it is smaller. This makes it easier to fit and thus the residuals are smaller than those of a large flare with higher signal-to-noise ratio.