Your plot should now look something like this.
| Quercus rubra | 5-7 | 7-9 | 9-11 | 7-9 | 9-11 | 9-11 | 11-13 | 11-13 | 9-11 | 11-13 | 13-15 | 15-17 |
| Quercus alba | 11-13 | 9-11 | 5-7 | 9-11 | 11-13 | 7-9 | 7-9 | 7-9 | 5-7 | 7-9 | 7-9 | 5-7 |
A pattern is emerging. Now modify your plot to include all twelve data points for each species.