Fig. 3: RoMAG measurements along the Zhurong traverse.

a, Measured horizontal magnetic fields components of crustal origin at 16 sites along the Zhurong traverse overlaid on an image of surface features from Tianwen-1’s high-resolution imaging camera. Coloured dots and numbers show the locations and the sols of magnetic observations, respectively. Black lines indicate horizontal components of the magnetic vector. The values of the measurements along the Zhurong traverse at 16 sites are shown in Extended Data Fig. 4. b,c, The northwards (b) and eastwards (c) magnetic component at 16 observation points in the geographic frame of Mars. The error bar overplotted on each of the 16 points is the uncertainty calculated from the error propagation (Extended Data Fig. 4). d, The distribution of horizontal components in the geographic frame of Mars. The black star marks the vector mean of the horizontal fields at 16 locations. Colour codes in a–d are the same.