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We study the anomalous conductance plateau around G = 0.7(2e^2/h) and the zero-bias anomaly in ballistic hole quantum wires with respect to in-plane magnetic fields applied parallel B_∥ and perpendicular B_ to the quantum wire. As seen in electron quantum wires, the magnetic fields shift the 0.7 structure down to G = 0.5(2e^2/h) and simultaneously quench the zero bias anomaly. However, these effects are strongly dependent on the orientation of the magnetic field, owing to the highly anisotropicdoi:10.1103/physrevlett.100.016403 pmid:18232794 fatcat:w5464m3lozh7bixcupgcqr5vvu