Weblab supports a heterogenious distribution of jump angles. In this case the final spectrum is a superposition of motional averaged spectra calculated for several jump angles and weighted with the probability given by a distribution function.  Possible distributions are:
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<div id="distribution">
<table>
<tr>
<td>Box</td><td><img src="help/images/superposjump-1.png"></td><td></td>
</tr><tr>
<td>Gauss</td><td><img src="help/images/superposjump-2.png"></td><td></td>
</tr>
</table>
</div>
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From the cone menu you supply &varphi;<sub>0</sub> as the center of the distribution as well as the full width 2&sigma;. All values are entered in degree. The use of these formulas should be restricted to small values of &sigma;.
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Please note the difference between <i>jump angle distribution</i> in section <i>Cone Menu</i>, which is available in <i>fast case</i>, and <i>jump angle distribution</i> in section <i>Superposition</i>. While the first describes jumps of one molecule or bond, whose jump angles are smeared out by a certain degree, leading to one averaged spectrum, the latter accounts for jump processes described by a distribution of spectra with different jump angles, thus taking into account a certain heterogeneity within the sample.
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When pressing <i>View</i>, weblab shows a sketch of the distribution function, it will use in its calculation.
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It is not possible, to consider a distribution of cone axes or jump rates together with a  distribution of jump angles. If you are interested in one of these, set 'no' for <i>jump angle distribution</i>. 
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Jump angle distribution is not avaliable, when 4 or 6 sites are selected. These cases are limited to fixed jump angels of 90&deg; or 66.67&deg; respectively.