Marginal posteriors under models M₁ and M₂ and model-averaged posterior for the magnetic field strength for the oscillation with P = 99 min analysed by Zhang et al. (2017). A uniform prior, 𝒰(B [G]; 1, 100), and a Gaussian density prior, 𝒢(n [cm⁻³]; μ_n, σ_n), with μ_n = 4.25 × 10¹⁰ cm⁻³ and σ_n = 0.2μ_n have been used. The numerical summaries of the posteriors are given in Table 1. A value of σ_P = 10 min and a 2D grid with N_n = N_B = 800 points were considered.