Definitions of the various parameters used can be found here. Links to individual parameters are also available below.

Number of bodies to be integrated: -Note that larger numbers of bodies will take longer to simulate Select the form of background potential to impose (look here for details): No Background Potential Power Law Potential Time Dependent Bar Potential Harmonic Potential Isochrone Potential Homogeneous Sphere Potential "Galaxy Potential" The various forms of background potentials require variable inputs; see potential descriptions for specific use of each parameter for the selected potential: param1: param2: -Note: The "Galaxy Potential" doesn't use these parameters Select the method of integration for the background potential. These methods are described here. Euler Leapfrog Midpoint Runge-Kutta Cash-Karp Self Gravity Leapfrog In addition to (or instead of) a background potential, the simulator can integrate using the self-gravity of the bodies (see here for details). Select the desired self-gravity integration method: No Self Gravity Direct Force Summation Fourier Method Choose the time duration of the simulation: -Note: Large values are allowed, but be aware that simulation time (and mpeg download time) will grow accordingly. Enter the simulation timestep; ie, the time differential used to evolve particle trajectories: Enter the image dumping frequency; ie, the number of timesteps to elapse between movie frames: Enter the radial density distribution dispersion variable alpha: -Note: smaller values of alpha lead to a more defined ring Select the dimensions in pixels of each MPEG frame: 704 x 576 352 x 288 176 x 144 -Note: Larger MPEGs will take longer to produce and download.