text: var nodes = new vis.DataSet([
                               /* {id: a, label: b, ...}, */
  {id: '3904', label: 'D1\nA4', color: '#31b0d5', title: 'Name: D1<br>Alias: null<br>Value: A4<br>Type: CELL_WITH_VALUE<br>Id: 3904<br>Formula Expression: Formula String: D1; Formula Values: A4; Formula Ptg: A4; Ptgs: D1 Index in Ptgs: 0 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@31cd0efa'},
  {id: '3901', label: 'E6\n#REF!', color: '#31b0d5', title: 'Name: E6<br>Alias: null<br>Value: #REF!<br>Type: CELL_WITH_REFERENCE<br>Id: 3901<br>Formula Expression: Formula String: VALUE; Formula Values: #REF!; Formula Ptg: ; Ptgs:  Index in Ptgs: 0 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@31cd0efa'},
  {id: '3902', label: 'VALUE\n#REF!', color: '#31b0d5', title: 'Name: VALUE<br>Alias: null<br>Value: #REF!<br>Type: CONSTANT_VALUE<br>Id: 3902<br>Formula Expression: Formula String: VALUE; Formula Values: #REF!; Formula Ptg: #REF!; Ptgs: VALUE Index in Ptgs: 0 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@31cd0efa'},
  {id: '3903', label: 'E7\nA4', color: '#31b0d5', title: 'Name: E7<br>Alias: null<br>Value: A4<br>Type: CELL_WITH_REFERENCE<br>Id: 3903<br>Formula Expression: Formula String: D1; Formula Values: A4; Formula Ptg: ; Ptgs:  Index in Ptgs: 0 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@31cd0efa'}
                              ]);
  
  
  var edges = new vis.DataSet([
                               /* {from: id_a, to: id_b}, */
  {from: '3902', to: '3901'},
  {from: '3904', to: '3903'}
                              ]);