Fitting results of FRB 20220529 by the flare scenario. (a): Model fitting of the RM behavior. A baseline value $\overline{\mathrm{RM}}=21.2$ rad m⁻² has been subtracted. The shaded pink region shows the RM variation range outside the abrupt RM change period. (b): Time evolution of DM and τ_ff under the best-fitting parameters in Table 1. The DM contribution by the ejecta is very small, compared to the stochastic fluctuation shown by the shaded cyan area.