x</a><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span><a href="#gravitationalMass.gravitationalMass-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></li><li class="tsd-description"><div class="tsd-comment tsd-typography"><p>Returns the mass of the vertex,
the value of <a href="ForceDirectedVertex.html#mass" class="tsd-kind-accessor">ForceD