Average bias on 10⁶ MC noise simulations on in the uniform distribution of the true angles ψ(x + l_i) (colored curves) and the dispersion of the average bias in the random distribution of the true angles (gray areas) in the canonical case of the noise covariance matrix (ε_eff = 1). The colored curves are shown from top to bottom in the same order as the legend lines on the right part of the figure. The dashed line represents the zero bias level.