As Fig. 10, but for the bias in the hydrostatic-equilibrium mass. One perturbed halo, D03–a, is not shown because its values are outside the plot range, being, from top to bottom, b(M_he) = −0.22, −0.21 and −0.19, respectively. D27–a is also outside the plot range in the top and central panels, with b(M_he) = −0.25 and −0.17, respectively.