Structure functions and scaling indices of magnetic field in the fast solar wind at 1.48 au observed by Ulysses. (a)–(c) S^q versus τ (bottom axis) and L (upper axis, in unit of the ion inertial length, d_i) measured in the radial direction, and in the directions perpendicular and parallel to the local magnetic field, respectively. The blue, orange, green, red, and purple represent S^q of order q = 1, 2, 3, 4, 5, respectively. The dashed yellow and cyan lines are power-law fits to S_q in subranges 1 and 2, shown with red and black shadows, respectively. (d)–(f) ξ(q), ξ_⊥(q), ξ_∥(q). The black and red represent the results in subrange 1 and 2, respectively. The horizontal dashed lines denote ξ = 1/2, 2/3, 1, respectively. The standard errors of these indices are small and no larger than the size of the markers.