Posterior distribution for 1 − γ and the corresponding values of α₀ in the Brans–Dicke framework with the implementation of the SEP violation. Red line (dot-dashed): 99.7% C.L. ((1 − γ) = 2.83 × 10⁻⁵ and α₀ = 3.762 × 10⁻³). Blue line (dotted): 66.7% C.L. ((1 − γ) = 1.92 × 10⁻⁵ and α₀ = 3.096 × 10⁻³). Purple line (dashed): 95% C.L. ((1 − γ) = 2.70 × 10⁻⁵ and α₀ = 3.675 × 10⁻³). The prior for (1 − γ) is a uniform prior between 0 and 15 × 10⁻⁵.