r>
<a name=c_speedlight><li>                 <span style="display:inline-block;background:#EEEEEE;width:400px">               <b>c_speedlight</b>  </span>  
<br><br>
<i>Optional</i><br>
Default: 137.035999074<br><br>
Varible used to change the value of the speed of light. Default value 137.035999074.</li><br>
<hr>
<a name=parabolic_conf><li>                 <span style="display:inline-block;background:#EEEEEE;width:400px">               <b>parabolic_conf</b>  </span>  
<b><font color="red">EXPERIMENTAL</fon