link,
the value of <a href="ForceDirectedEdge.html#stiffness" class="tsd-kind-accessor">ForceDirectedEdge.stiffness</a> if it&#39;s a number,
or else the value of <a href="ForceDirectedLayout.html#defaultSpringStiffness" class="tsd-kind-accessor">defaultSpringStiffness</a>.</p>
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