as described in 
[<a href="Bibliography.html" target="page">Ask09</a>].
Code 5025.
  

<p/>
The following LED processes with virtual graviton exchange are 
available.

<p/><code>flag&nbsp; </code><strong> ExtraDimensionsLED:ffbar2gammagamma &nbsp;</strong> 
 (<code>default = <strong>off</strong></code>)<br/>
Scatterings <i>f fbar -> (LED G*) -> gamma gamma</i>. If the 
graviton contribution is zero, the results corresponds to the 
SM contribution, i.e. equivalent to 
<code>PromptPhoton:ffbar2gammagamma</cod