  It has been shown in an earlier publication that magnetic field gradients
applied to particles in traps can induce Larmor frequency shifts that may
falsely be interpreted as electric-dipole moment (EDM) signals. This study has
now been extended to include nonuniform magnetic field gradients due to the
presence of a local magnetic dipole. It is found that, in the high
orbit-frequency regime, the magnitude of the shifts can be enhanced beyond the
simple expectation of proportionality to the volume-averaged magnetic-field
gradient.
