Spatio-temporal spectral properties of magnetic fluctuations. Colour-scale plots of reduced 2D spectra of (top panels) B_⊥ and (bottom panels) B_∥ as a function of (left panels) k_⊥ and ω and (right panels) k_∥ and ω for the time interval 95 ≤ tΩ_i ≤ 350. All the panels share the same arbitrary logarithmic colour scale. The dotted lines show the Alfvénic dispersion ω = ±k_∥v_A (panel b) and the fast magnetosonic wave dispersion ω = ±k_⊥v_f (panel c), respectively.