A 3.9-sigma dipole in the Tully-Fisher zeropoint could indicate 3% anisotropic Hubble expansion, but it is degenerate with a bulk flow; future surveys should resolve it.
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Testing anisotropic Hubble expansion
A 3.9-sigma dipole in the Tully-Fisher zeropoint could indicate 3% anisotropic Hubble expansion, but it is degenerate with a bulk flow; future surveys should resolve it.