Notes. Parameters of the fitting processes of the spectrum of SN 2019oys on Δt = 201 and 221 days pertaining to Eq. (5) with and without additional FFA. The fitted parameters are the radio spectral peak, F_v,a, its frequency, v_a, and the optically thin spectral slope, β. Δt = 201 days are marked with ^a as we used the β fitted for Δt = 221 days (due to the lack of spectral coverage). When fitting FFA as an additional absorption mechanism, we also fitted for the FFA frequency, v_ff. DOF is the number of degrees of freedom.