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      ========================================================================
      Apache ECharts Subcomponents:
      
      The Apache ECharts project contains subcomponents with separate copyright
      notices and license terms. Your use of the source code for these
      subcomponents is also subject to the terms and conditions of the following
      licenses.
      
      BSD 3-Clause (d3.js):
      The following files embed [d3.js](https://github.com/d3/d3) BSD 3-Clause:
          `/src/chart/treemap/treemapLayout.ts`,
          `/src/chart/tree/layoutHelper.ts`,
          `/src/chart/graph/forceHelper.ts`,
          `/src/util/number.ts`
      See `/licenses/LICENSE-d3` for details of the license.