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Fig. 1.
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Global TEC map in TECu from CODE GIMs at 12:00 UT, June 30, 2010 or Day Of Year (DOY) 181. The black triangles represent the GNSS stations (253 sites in 2010) used to model the ionosphere. White lines are the geomagnetic coordinates (dipole model) from IGRF11 (Finlay et al. 2010).
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