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Research Article

Fig. B.2

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Representation of Petit Cru at point A with the main angles and vectors. The plane of Petit Cru is represented in blue with its basis vectors (R * = {x *y *z *}). is composed of the three vectors {Up, East, North}. Angles α and ε are the azimut and elevation respectively. B proj is the projection of the magnetic field at point H on the plane of Petit Cru, and η is the apparent angle we want to calculate.

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