| RecYear | | Physical quantity | Year of sample |
| RecDate | | Date/time | Date that data was collected |
| TimeOfDay | | Nominal | Time of day that measurement was taken (midday vs. predawn) |
| Species | | Nominal | Species (Andropogon gerardii vs. Cornus drummondii) |
| Shelter | | Physical quantity | Shelter number (1-14) |
| BurnTrt | | Code list | Burn treatment (1-yr burn vs. 4-yr burn) |
| DroughtTrt | | Code list | Drought treatment (control vs. drought) |
| Replicate | | Nominal | Replicate (a, b) |
| WP_bar | | Physical quantity | Leaf water potential (measured in bar) |
| WP_MPa | | Physical quantity | Leaf water potential (measured in MPa) |
