These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Mass of the node. By default, each node has mass equal to it's marker radius . Mass is used to determine how two connected nodes should affect each other:
Attractive force is multiplied by the ratio of two connected nodes; if a big node has weights twice as the small one, then the small one will move towards the big one twice faster than the big one to the small one .