| Region | Relationship | LnSR | Exp‐Ctl |
|---|---|---|---|
| Tropical (4–23°) | Second order polynomial | 1.36 | 3.89 |
| Sub–tropical (26–35°) | Linear | NA | NA |
| Temperate (36–53°) | Linear | NA | NA |
| Polar (62–78°) | Second order polynomial | NA* | NA* |
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