
first incoming particle.
  

<p/><code>parm&nbsp; </code><strong> Beams:maxDevA &nbsp;</strong> 
 (<code>default = <strong>5.</strong></code>; <code>minimum = 0.</code>)<br/>
The triply Gaussian distribution <i>(p_x, p_y, p_z)</i> is restricted to 
a maximal total deviation from the nominal values <i>(p_x0, p_y0, p_z0)</i>
for the first incoming particle, like
<br/><i>
(p_x - p_x0)^2/sigma_px^2 + (p_y - p_y0)^2/sigma_py^2 +
(p_z - p_z0)^2/sigma_pz^2 < maxDev^2
</i><br/>
(Note the absence of a factor 2 in t