}
private Graph calculateTotalGraph(UserRequest ureq, int columnId) {
ColumnDescriptor cd = tableCtr_.getColumnDescriptor(columnId);
String headerKey = cd.getHeaderKey();
if (cd.translateHeaderKey()) {
headerKey = headerTranslator_.translate(headerKey);
}
String selectionInfo = headerKey;
String chartIntroStr;
if (columnId==tableCtr_.getTableDataModel().getColumnCount()-1) {