Correlation diagrams for the probability distributions of the v_tot model parameters, for the first order v_conv function. Green and blue lines show the 1 and 2σ simultaneous 2D confidence regions that contain respectively 39.3% and 86.5% of the accepted steps. 1D histograms correspond to the distributions projected on the space of each line parameter. The red line and white point show median values. Note ψ is derived from Eq. (14) and is not an MCMC jump parameter.