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(a) The geographic grid used for this study, which is at the JPL/GIM longitude × latitude resolution of 5° × 2.5°. The Greenwich Meridian is highlighted by a red line. The blue lines indicate the 12 reference longitudes used in the analysis. (b) The geomagnetic grid used for this study is at Mlon × Mlat resolution of 5° × 2.5°. resolution. The location of magnetic longitude of 0° is indicated by the red line. The blue lines indicate the 12 reference magnetic longitudes used in the analysis.
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