| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real, | intent(in) | :: | tyear | time as fraction of year (0-1, 0 = 1jan.h00)  | 
  
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| real, | intent(in) | :: | csol | The solar constant [W/m^2]  | 
  
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| real, | intent(out) | :: | topsr(il) | Daily-average insolation at the top of the atmosphere as a function of latitude  |