Analysis of 10 000 simulated halos with 500 particles. Upper panel: Relative differences (Δa, Δb, Δc) in the recovered semi-axes (a,b,c) as a function of the sphericity (c/a). Lower panel: Difference between the recovered angles (ψ, θ, ϕ) and their true simulated values expressed in deg as a function of the sphericity (c/a). Blue lines indicate the median of the distributions and the grey area shows the quartiles.