elAmps_modelname.h/cc</code>, and the process files for each 
process class (with the same mass, spin and color of the initial/final 
state particles) are called <code>Sigma_modelname_processname.h/cc</code>. 
The directory also contains a <code>makefile</code> and a model parameter 
file <code>param_card_modelname.dat</code>.</li>  
<li>An example main program in the directory <code>examples/</code> 
(in the <code>pythia81xx</code> main directory) called 
<code>main_modelname_N.cc</code> and a correspondin