Parameter space and probability distribution functions for the virial radius, mass profile scale radius, and velocity anisotropy, as found by MAMPOSSt. The coloured regions are the 1, 2, 3σ confidence regions, while the red stars and the red arrows locate the best-fit values. These are based upon an MCMC analysis with 6 chains of 40000 elements each, with the first 5000 elements of each chain removed (this is the burn-in phase that is sensitive to the starting point of the chain). The priors were flat within the range of each panel, and zero elsewhere.