Observed Hα-line profiles in kernels 1-3 overplotted on the Hα line profiles simulated with the HYDRO2GEN code (Druett & Zharkova 2018) in flaring atmospheres produced by the following. (a) An electron beam with a spectral index of 4 and an initial energy flux of 10¹⁰ erg⋅cm⁻²s⁻¹. (b) An electron beam with a spectral index of 4 and an initial energy flux of 10¹¹ erg⋅cm⁻²s⁻¹. (c) A mixed beam with a spectral index of 4 and an initial energy flux of 10¹³ erg⋅cm⁻²s⁻¹. (d) A mixed beam with the same parameters as in (c). The observed Hα line profiles are shown in kernel 1 (blue line), kernel 2 (light blue line), and kernel 3 (green line). The vertical lines show the spectral window ±1.5 Å for the CRISP/SST Hα line observations.