 <i>pbar p</i> collisions. The description of 
diffractive events, and especially their slopes, remains unchanged. 

<p/><code>flag&nbsp; </code><strong> SigmaElastic:setOwn &nbsp;</strong> 
 (<code>default = <strong>no</strong></code>)<br/>
Allow a user to set parameters for the normalization and shape of the
elastic cross section the by hand; yes/no = true/false.
  

<p/><code>parm&nbsp; </code><strong> SigmaElastic:bSlope &nbsp;</strong> 
 (<code>default = <strong>18.</strong></code>; <code>minimum = 0.<