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Magnetic Particle Imaging (MPI) is a versatile new imaging technique for mapping the spatial distribution of magnetic nanoparticle (MNP) based tracers in vivo and in real time with high sensitivity. Reconstruction of 3D-encoded MPI data with high temporal resolution so far relies on the so-called system matrix approach. Here, the image is obtained by solving a linear system of equations involving pre-measured data from a point sample moved over the later reconstrution grid. A study of these pre-measured data, or system matrices, is a useful way of gaining insight into the MNP properties. Unfortunately, the size of the datasets, which easily reaches dozens of gigabytes, presents an obstacle for a visual inspection and analysis. Here we present a tool for convenient inspection of MPI system functions with versatile navigation and visualisation features.