Regions of matched MSFs between the gas pressure and parallel velocity (left) and the magnitude of the magnetic field and perpendicular velocity (middle) at z = 4 Mm. The frequencies are considered matched if they are within ± ∼ 0.53 mHz (1 frequency step) of each other. The right panel shows the results from the left two panels overlaid to show overlapping regions. ‘Magnetic’ fluctuations are shown in red, whilst ‘acoustic’ fluctuations are in blue. Here, the magnitude of the frequencies is omitted. The magnitude of parallel velocity is shown for reference in the background. For all plots, MSF’s of 0 mHz have been removed as a trivial result.