uring symmetrization:
       ADD = weights of each arc are added <br/>
       MAX = only the heaviest arc weight is kept <br/>
<!--        ERROR = fail if complementary arcs don't have the same weight. -->
</td>
    </tr>

    <tr nosave="" valign="top">
      <td>&nbsp;&nbsp;&nbsp; <i>GRAPH_BUILD_TYPE</i></td>
      <td nosave="">Type of input, do allow some optimizations in the build process:<br/>
       NORMAL = graph is generic, no optimization can be performed<br/>
       FAST = graph global IDs are in