mega_sigma_calc</b>  </span>  
<br><br>
<i>Optional</i><br>
Default: 1<br><br>
Sets the number of frequencies where the GW self-energy is actually calculated.</li><br>
<hr>
<a name=nstep_dav><li>                 <span style="display:inline-block;background:#EEEEEE;width:400px">               <b>nstep_dav</b>  </span>  
<br><br>
<i>Optional</i><br>
Default: 15<br><br>
Sets the maximum number of Davidson partial diagonalization steps. Used for TD-DFT, BSE, and full CI.</li><br>
<hr>
<a name=nstep_gw><li>     