ld contain dynamic parameters relevant to the motional simulation. To specify the rate of rotational diffusion, give one of the fields <code>tcorr</code>, <code>logtcorr</code>, <code>Diff</code>, or <code>logDiff</code>.
</p>

<div class="optionfield"><code>tcorr</code></div>
<div class="optiondescr">
Rotational correlation time, in seconds.
<ul>
<li>1 number <code>txyz</code>: isotopic diffusion, corresponding to <code>[txyz txyz txyz]</code>
<li>2 numbers <code>[txy tz]</code>: anisotropic diffusion with