Mass bias for NFW (orange) and Einasto (purple) fits of the Σ-profiles when aligned with the principal axes of the clusters regarding their moments of inertia. Solid lines correspond to 0_pr_axes, dashed lines to 1_pr_axes, and dotted lines to 2_pr_axes. We give the value of the median and the 16th and 84th percentiles. Shaded areas represent the 1σ regions of the bias obtained for all the clusters with the three random projections (Fig. 4).