Averaged power spectra of magnetic field (in Alfvén speed) and velocity for different R and V_r. Left: 35≤ R∕R_s ≤ 45 and 300 km s⁻¹ ≤ V_r ≤ 350 km s⁻¹. Middle: 65 ≤ R∕R_s ≤ 75 and 300 km s⁻¹ ≤ V_r ≤ 350 km s⁻¹. Right: 35 ≤ R∕R_s ≤ 45 and km s⁻¹ ≤ V_r ≤ 250 km s⁻¹. The spectra were fitted over 2.8 × 10⁻³ s⁻¹ ≤ f ≤ 1.7 × 10⁻² s⁻¹ as shown by the dotted (for magnetic field) and dashed (for velocity) lines and the fitted slopes are written in the legend.