Best-fit acceleration A₀ matching the effective velocity dispersion when emulating EMOND at the average distance d_mean, with the external field derived from the dominant hot gas distribution. Plain black circles correspond to an anisotropy parameter β = 0 and the open magenta circles to β = 0.5. Plain lines correspond to linear fits and dashed lines to the averages. A cluster acceleration A₀ = 10 × a₀ provides reasonably good fits to the velocity dispersion measurements, especially when some radial anisotropy is allowed (cf. also Fig. D.1).