Comparison of mass accretion rates, K-Band magnitudes, and observations during a TI outburst. Top panel: Mass accretion rate onto the star of mass M_* = 20 M_⊙ during a TI outburst. The horizontal dashed line shows the Ṁ_th value calculated with Eq. (8). Second panel: Model K-band magnitudes during the TI outbursts (solid black line) and the observed K-band photometry for the S255IR NIRS3 source from Fedriani et al. (2023) (blue dots). The K-band magnitudes for the model with the optical extinction A_v = 60 is shown with the dashed black line. The red line corresponds to the model B-band magnitudes. The time t = 0 corresponds to the beginning of the model TI outburst and to the beginning of the observed outburst on S255IR NIRS3 registered in June 2015. Third panel: K-band magnitudes for the model presented in the top two panels of the figure (black line) and for two other models with the higher Ṁ_dep. The blue dots represent the observational data also shown in the second panel. Bottom panel: Mass accretion rate histories during the TI bursts in the models shown in the third panel with the corresponding colour. The horizontal dashed line marks the Ṁ_th value. The time t = 0 is similar to that in the top two panels. The blue dot marks the observed peak mass-accretion rate value on S255IR NIRS3 during the outburst.