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. 2014 Oct 4;200(12):983–996. doi: 10.1007/s00359-014-0947-6

Fig. 3.

Fig. 3

Behavior of Helmholtz coils. The magnetic intensity produced by each Helmholtz coil pair used in isolation (open triangle) is a linear function of the current traversing each pair (data for all three pairs). When the three coils are energized concurrently, the deviations are minor (filled circle). Thus, the X, Y and Z components of the induced magnetic field are almost orthogonal