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| Fit parameter | Units | Fixed value | Lower bound | Upper bound |
|---|---|---|---|---|
| log kr | log(quanta·μm-2·s-1) | 4.5 | 1 | 6 |
| log kg | log(quanta·μm-2·s-1) | 4.0 | 1 | 6 |
| log kb | log(quanta·μm-2·s-1) | 3.5 | 1 | 6 |
| log ku | log(quanta·μm-2·s-1) | 3.0 | 1 | 6 |
If Eq 1 curve fits lie outside these boundaries, a fixed value of semi-saturation for red (kr), green (kg), blue (kb), or UV (ku) cones is substituted.
