Posterior joint and marginalised distributions of the free model parameters, E_0, iso^c, θ_c, θ_v, n_ext, ϵ_B, ϵ_e, ζ, pa, Γ₀^c, b, for the “SSC (with KN)” fit of the afterglow of GW 170817 presented in Sect. 4, which includes SSC scatterings in the Thomson and KN regimes. The priors are all uniform or log-uniform and are shown in Table 3. The fitted data include all points until t_max = 400 days, as well as five early-time upper limits (see Sect. 4.1). The coloured contours correspond to the 1σ, 2σ, and 3σ confidence intervals for each parameter.