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  "Description": "Run simple direct gravitational N-body simulations. The\npackage can access different external N-body simulators (e.g.\nGADGET-4 by Springel et al. (2021)\n<doi:10.48550/arXiv.2010.03567>), but also has a simple\nbuilt-in simulator. This default simulator uses a variable\nblock time step and lets the user choose between a range of\nintegrators, including 4th and 6th order integrators for\nhigh-accuracy simulations. Basic top-hat smoothing is available\nas an option. The code also allows the definition of background\nparticles that are fixed or in uniform motion, not subject to\nacceleration by other particles.",
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