Azimuthal averages of the LOS and transverse field components (first row, left and right panels, respectively), the field inclination in respect to the vertical and the logarithm of plasma β (second row, left and right panels, respectively). In all panels, the solid line corresponds to the base of the extrapolated field, at ~250 km. The dotted lines correspond to extrapolation heights increasing progressively by 235 km from the highest to the lowest curve. In all cases, 0″ corresponds to the center of the rosette (see Fig. 1).