text: var nodes = new vis.DataSet([
                               /* {id: a, label: b, ...}, */
  {id: '376', label: 'A4\n#REF!', color: '#31b0d5', title: 'Name: A4<br>Alias: null<br>Value: #REF!<br>Type: CELL_WITH_FORMULA<br>Id: 376<br>Formula Expression: Formula String: A1 + C1 + Sheet2!B1; Formula Values: 20.0 + 5.0 + #REF!; Formula Ptg: ; Ptgs:  Index in Ptgs: 0 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@4efcf8a'},
  {id: '377', label: 'A1\n20.0', color: '#31b0d5', title: 'Name: A1<br>Alias: null<br>Value: 20.0<br>Type: CELL_WITH_VALUE<br>Id: 377<br>Formula Expression: Formula String: A1; Formula Values: 20.0; Formula Ptg: 20.0; Ptgs: A1 Index in Ptgs: 0 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@4efcf8a'},
  {id: '378', label: 'C1\n5.0', color: '#31b0d5', title: 'Name: C1<br>Alias: null<br>Value: 5.0<br>Type: CELL_WITH_VALUE<br>Id: 378<br>Formula Expression: Formula String: C1; Formula Values: 5.0; Formula Ptg: 5.0; Ptgs: C1 Index in Ptgs: 1 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@4efcf8a'},
  {id: '379', label: '+\n25.0', color: '#f0ad4e', title: 'Name: +<br>Alias: null<br>Value: 25.0<br>Type: OPERATOR<br>Id: 379<br>Formula Expression: Formula String: A1 + C1; Formula Values: 20.0 + 5.0; Formula Ptg: ; Ptgs:  Index in Ptgs: 2 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@4efcf8a'},
  {id: '380', label: 'Sheet2!$B$1\n#REF!', color: '#31b0d5', title: 'Name: Sheet2!$B$1<br>Alias: null<br>Value: #REF!<br>Type: CELL_WITH_VALUE<br>Id: 380<br>Formula Expression: Formula String: Sheet2!B1; Formula Values: #REF!; Formula Ptg: #REF!; Ptgs: Sheet2!$B$1 Index in Ptgs: 3 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@4efcf8a'},
  {id: '381', label: '+\n#REF!', color: '#f0ad4e', title: 'Name: +<br>Alias: null<br>Value: #REF!<br>Type: OPERATOR<br>Id: 381<br>Formula Expression: Formula String: A1 + C1 + Sheet2!B1; Formula Values: 20.0 + 5.0 + #REF!; Formula Ptg: ; Ptgs:  Index in Ptgs: 4 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@4efcf8a'}
                              ]);
  
  
  var edges = new vis.DataSet([
                               /* {from: id_a, to: id_b}, */
  {from: '378', to: '379'},
  {from: '380', to: '381'},
  {from: '377', to: '379'},
  {from: '379', to: '381'},
  {from: '381', to: '376'}
                              ]);