Weblab can simulate orientational order in uniaxial systems  where the orientational distribution can be specified by a single angle &beta;<sub>D</sub> between the macoroscopic director (DF), <span>z<sup>(DF)</sup></span>, and the molecular axis of the mesogenic system (GF), <span>z<sup>(GF)</sup></span>.
The relevant coordinate systems are as follows:

<center><img src="help/images/frames-order.png"></center>

You have to supply the angle &beta;<sub>0</sub> between the magnetic field <b>B</b><sub>0</sub> and the the director and the quantities, which describe the orientation distribution for angle &beta;<sub>D</sub>. You also may select one of the following distributions:
<p>
<div id="distribution">
<table>
<tr><td>Single Value</td><td><img src="help/images/orderangle-1.png"></td></tr>
<tr><td>Sine-Gauss</td><td><img src="help/images/orderangle-4.png"></td></tr>
<tr><td>Legendre</td><td><img src="help/images/orderangle-5.png"></td></tr>
</tr>
</table>
</div>
<p>
In case of a Sine-Gauss distribution Weblab is using &sigma;=sin(&frac12; s<sub>fw</sub>) where s<sub>fw</sub> is the value in degree you enter from the cone menu. When using an expansion in terms of legendre polynomials you have to supply the even moments &lt;P<sub>2</sub>&gt; to &lt;P<sub>10</sub>&gt;. The expansion is normalized by setting &lt;P<sub>0</sub>&gt; = 1.
<p>
When pressing the <i>View</i> button Weblab shows a graphical representation of the distribution with the parameters you have entered. Here you also have the option to let Weblab calculate the apropriate expansion coefficients for a representation in terms of legendre polynomials.