Projection of the three dimensional ellipsoids of constant χ² on the r_p = const. (left), s = const. (center), and α₁ = const. (right) planes from fitting the F606W image. The contour levels show 1σ, 2σ, and 3σ levels of confidence, respectively. The cross indicates the position of the best-fit values. The plots illustrate very well the correlation between α₁ and s and the very weak correlations between these parameters and  r_p, respectively. For a detailed description of the parameters shown see Sect. 4.1.1.