NASA's Mars Global Surveyor shows radial magnetic field measured color coded on a global map of Mars that slows the larger craters and volcanoes (dark green), spacecraft tracks below 200 km (light green), and the dichotomy boundary (solid line).

The radial magnetic field measured is color coded on a global map that slows the larger craters and volcanoes (dark green), spacecraft tracks below 200 km (light green), and the dichotomy boundary (solid line).

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