lue, negative weights are in red. The heavier the link is, the more colored it is (semi-transparent links are close to 0.8 while others have a higher absolute weight).

<a href="http://totems.co/wp-content/uploads/2014/09/visu_nn_threshold_0_8.png"><img src="http://totems.co/wp-content/uploads/2014/09/visu_nn_threshold_0_8.png" alt="visu_nn_threshold_0_8" width="1632" height="620" class="alignnone size-full wp-image-11149" /></a>

We were surprised by the simplicity of the resulting structure, but aware tha