_old(s) + sigma_max)</i>. 
This reduces to <i>sigma_old(s)</i> at low energies and to 
<i>sigma_max</i> at high ones. Note that the asymptotic value 
is approached quite slowly, however.

<p/><code>parm&nbsp; </code><strong> SigmaDiffractive:maxXB &nbsp;</strong> 
 (<code>default = <strong>15.</strong></code>; <code>minimum = 0.</code>)<br/>
The above <i>sigma_max</i> for <i>A + B -> X + B</i> in mb.
  

<p/><code>parm&nbsp; </code><strong> SigmaDiffractive:maxAX &nbsp;</strong> 
 (<code>default = <strong>1