| Clue | Source | Date |
|---|---|---|
| They go up and down on graphs | ||
| Ups or downs on a graph | ||
| Vertical lines on graphs, in math | New York Times Mini | 28 Aug 2024 |
| Lines for which x = 0 | New York Times | 04 Aug 2024 |
| Vertical graph lines | Universal | 09 Nov 2022 |
| Some vertical graph lines | Universal | 16 Dec 2021 |
| Vertical graph lines | The Washington Post | 31 Dec 2016 |
| Graph baselines | ||
| Vertical lines in math | ||
| Vertical baselines | ||
| Some vertical lines | ||
| They're vertical | ||
| Cartesian concerns | ||
| Vertical baselines on graphs |