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Isolines of magnetic field elements along the coasts of North America derived from the World Magnetic Model for the year 2005. (A) Isoclinics (isolines of magnetic field inclination). Each region of the west coast is marked by a different inclination angle; a similar situation exists for the east coast. Adjacent isoclinics represent differences in inclination of 2°. (B) Isodynamics (isolines of total field intensity). Adjacent isolines represent differences in intensity of 1,000 nT.
