| 1 | 2 | 3 | 4 | 3 | 2 | 1 |
| 2 | 3 | 4 | 5 | 4 | 3 | 2 |
| 3 | 4 | 5 | 6 | 5 | 4 | 3 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| −3 | −4 | −5 | −6 | −5 | −4 | −3 |
| −2 | −3 | −4 | −5 | −4 | −3 | −2 |
| −1 | −2 | −3 | −4 | −3 | −2 | −1 |