Empirical Model for Estimating Global Solar Radiation on Horizontal Surfaces for Selected Cities in the Six Geopolitical Zones in Nigeria

Figure 2

Correlation between the estimated and observed values of the monthly mean daily global solar radiation. (a) Abuja, (b) Benin City, (c) Katsina, (d) Lagos, (e) Nsukka, and (f) Yola.

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(b)

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(e)

(f)