| RecYear | | Physical quantity | The year of data were collected |
| Date | | Date/time | The Date were data collected |
| RecMonth | | Physical quantity | The month were data collected |
| Site | | Nominal | Site name |
| Block | | Physical quantity | Block number |
| Plot | | Physical quantity | Plot number |
| Subplot | | Nominal | Subplot letter (A-Z), default value is 'A'. Other values may not be unique between sites. |
| Replicate | | Physical quantity | Replicate measurement of 2 |
| Ground | | Physical quantity | PAR in mmol m-2 s-1 at ground level |
| Above | | Physical quantity | PAR in mmol m-2 s-1 above the canopy |
| Par | | Physical quantity | ground/above |