  We have reanalyzed and compared the dipoles of the 1.2 Jy and 0.6 Jy (QDOT)
IRAS galaxy samples. We find strong indications from both samples for (a)
significant contributions to the gravitational field that shapes the Local
Group motion from depths up to $\sim 170$ $h^{-1}$ Mpc and (b) a large-scale
coherence of the dipole anisotropy, indications provided mainly by the fact
that the differential dipoles of large equal volume shells are aligned with the
CMB dipole and exhibit significant dipole signals. The two IRAS dipoles are
indistinguishable within 50 $h^{-1}$ Mpc and beyond $\sim 130$ $h^{-1}$ Mpc
while the QDOT dipole, having a lower flux limit, continues growing with
respect to the 1.2 Jy sample up to $\sim 100$ $h^{-1}$ Mpc in agreement with
Rowan-Robinson et al (1990). The most probable cause of these deep dipole
contributions is the Shapley mass concentration.
