Best fit to the July 28 flare with a vertical plus toroidal magnetic field. The colour gradient denotes the periodic evolution of the hotspot along its orbit, moving from darker shades to lighter as the hotpot completes a revolution. Considering θ_T ∈ [0° −90° ], a clockwise motion is preferred. The fit has a smaller reduced χ² at a slightly higher inclination than the best fit with a vertical plus radial field. The presence of a vertical component in the magnetic field is still required to fit the data better.