ownian diffusion to model the rotational tumbling of the spin system. The simulation is based on solving the Stochastic Liouville equation in a basis of rotational eigenfunctions. <code>chili</code> supports arbitrary spin systems.
</p>

<p>
<code>chili</code> takes up to three input arguments
</p>
<ul>
<li><code>Sys</code>: static and dynamic parameters of the spin system
<li><code>Exp</code>: experimental parameters
<li><code>Opt</code>: options and settings
</ul>

<p>
If no input argument is given, a sho