text: var nodes = new vis.DataSet([
                               /* {id: a, label: b, ...}, */
  {id: '437', label: 'C4\n2.0', color: '#31b0d5', title: 'Name: C4<br>Alias: null<br>Value: 2.0<br>Type: CELL_WITH_FORMULA<br>Id: 437<br>Formula Expression: Formula String: ERROR.TYPE(A2); Formula Values: ERROR.TYPE(#DIV/0!); Formula Ptg: ; Ptgs:  Index in Ptgs: 0 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@3b809711'},
  {id: '438', label: 'A2\n#DIV/0!', color: '#31b0d5', title: 'Name: A2<br>Alias: null<br>Value: #DIV/0!<br>Type: CELL_WITH_VALUE<br>Id: 438<br>Formula Expression: Formula String: A2; Formula Values: #DIV/0!; Formula Ptg: #DIV/0!; Ptgs: A2 Index in Ptgs: 0 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@3b809711'},
  {id: '439', label: 'ERROR.TYPE\n2.0', color: '#f0ad4e', title: 'Name: ERROR.TYPE<br>Alias: null<br>Value: 2.0<br>Type: FUNCTION<br>Id: 439<br>Formula Expression: Formula String: ERROR.TYPE(A2); Formula Values: ERROR.TYPE(#DIV/0!); Formula Ptg: ; Ptgs:  Index in Ptgs: 1 <br>Source Object Id: com.dataart.spreadsheetanalytics.engine.PoiProxyWorkbook@3b809711'}
                              ]);
  
  
  var edges = new vis.DataSet([
                               /* {from: id_a, to: id_b}, */
  {from: '438', to: '439'},
  {from: '439', to: '437'}
                              ]);