Corner plot with the parameters of the RVM fit to the polarisation profile of PSR J1012−4235. Φ₀ is the spin phase where the magnetic pole is closest to the line of sight, Ψ₀ is the position angle of the linear polarisation at Φ₀, α is the angle between the spin axis and the magnetic axis, and ζ is the angle between the line of sight and the spin axis, which is given by ζ = α + β, where β is the minimum angle between the line of sight and the magnetic axis.