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Scientific Investigations Report 2005–5045: Equation 1
These gradients can be arranged into a matrix called a magnetic gradient tensor, mathematically expressed as:

G =

[
∂ bx ⁄ ∂ x ∂ by ⁄ ∂ x ∂ bz ⁄ ∂ x
∂ bx ⁄ ∂ y ∂ by ⁄ ∂ y ∂ bz ⁄ ∂ y
∂ bx ⁄ ∂ z ∂ by ⁄ ∂ z ∂ bz ⁄ ∂ z

]
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