Chunk #228 — 3 Inverse solutions — 3.2 Parametric methods — 3.2.2 Beamforming approaches
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where G(r) = [g(r, e x ), g(r, e y ), g(r, e z )] is the N × 3 forward matrix for three orthogonal dipoles at location r having orientation vectors e x , e y and e z respectively, I is the 3 × 3 identity matrix and δ represents a small distance.