Fig. 3From: Cluster observation of magnetohydrodynamic turbulence in the plasma sheet boundary layerMagnetic energy spectrum in the spacecraft-frame frequency domain for the trace of cross-spectral density matrix (in black), and the parallel (in dark gray) and the perpendicular (in thin gray) fluctuations to the large-scale magnetic field direction. The spectral curves are obtained on the time interval 1300–1500 UT and are averaged over four spacecraft of ClusterBack to article page