En = Qn/(ρλ)
Ea = 86400[(ρacp)/(ρλγ)](es-ea)(rs+ra)-1
Δ = (0.00815 Ta + 0.8912)7
γ∗ = γ [1 + (rs/ra)]
E = (Δ En + γ∗ Ea) / (Δ + γ∗)
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