Posterior distribution for a MCMC sampling of the composite log-likelihood reported in Eq. (26) for rise, decay, and delay time in Eq. (25). To sample the parameter space, we use uninformative flat priors, with m_B ∈ [0, 1], ϕ ∈ [1/3, 1], GHz, β_exp ∈ [10⁻⁴, 1]. The range of is determined by setting a flat range for the observed γ-ray variability timescale days, and setting , corresponding to cm. We plot the posterior contour maps (where the solid black identifies the 1-σ containment for a bivariate Gaussian distribution). On the diagonal, we plot the marginalised posterior distributions, and with the vertical dashed black lines we indicate the 0.16, 0.5, and 0.84 quantiles. The blue vertical line in the histogram identifies the 15 GHz observed OVRO frequency. On top of each marginalised histogram we report the confidence level corresponding to the quantiles.