The authors have analysed the combined Abell-ACO cluster catalogue with m10 ⪉ 16.4 which is 80% redshift complete. Taking into account different models of the extinction region they find the cluster dipole pointing within ⪉10° of the CMB dipole direction which indicates that clusters are tracers of mass. The dipole amplitude converges at ≡150 h-1Mpc, within the completeness limit of the catalogue. The authors find that the anisotropy which is responsible for the LG motion with respect to the CMB rest frame extends in depth and has a scalength of ≡300 h-1Mpc. Most of the Local Group peculiar velocity is induced by matter fluctuations within ≡50 h-1Mpc. Shapley's concentration (otherwise known as "Giant Attractor" or "alpha region") at a depth of ≡140 h-1Mpc, is responsible for ⪉20% of the Local Group's peculiar velocity. Finally, using linear perturbation theory, the authors find that Ω0 ⪉ 0.3.
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