</strong></code>; <code>minimum = 0.</code>)<br/>
The width of a Gaussian distribution of the <i>x</i> location of the
interaction vertex. 
  

<p/><code>parm&nbsp; </code><strong> Beams:sigmaVertexY &nbsp;</strong> 
 (<code>default = <strong>0.</strong></code>; <code>minimum = 0.</code>)<br/>
The width of a Gaussian distribution of the <i>y</i> location of the
interaction vertex. 
  

<p/><code>parm&nbsp; </code><strong> Beams:sigmaVertexZ &nbsp;</strong> 
 (<code>default = <strong>0.</strong></code>; <cod