Extended Data Fig. 2: Combined horizontal magnetic fields Bc measured during the mast rotations at 16 observation points.

a, Sketch of the rotating combined vector Bc = Bmars + Bbody, and the fixed field Bmast in the sensor frame. b, Sketch of the rotating vector Bmars, and the body field Bbody in the rover frame. c, Variations of field components along with the modeled fields (black lines) in the sensor frame as a function of mast yaw angles during the mast rotations. d, Hodograph of the horizontal components of Bc on the Bj-Bk plane in the sensor frame, where the beginnings and ends of the interval are marked by squares and triangles, respectively. e, The mean fitting errors of the horizontal component of Bc (sample size n = 153) with the 95% confidence interval (error bars).