// Create links table with some data
DataTable links = DataTable.create();
links.addColumn(DataTable.ColumnType.NUMBER, "from");
links.addColumn(DataTable.ColumnType.NUMBER, "to");
links.addColumn(DataTable.ColumnType.NUMBER, "length");
addRow(nodes, 1, "Main", DIR + "Network-Pipe-icon.png", "image");
addRow(nodes, 2, "Office", DIR + "Network-Pipe-icon.png", "image");
addRow(nodes, 3, "Wireless", DIR + "Network-Pipe-icon.png", "image");
addRow(links, 1, 2, LENGTH_MAIN);