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Table 2 Value of \(\psi_{i,j}\) according to the number of the month (J) and the climate zone (I)

From: Evaluation of global solar radiation from meteorological data in the Sahelian zone of Chad

I J 1 2 3 4 5 6 7 8 9 10 11 12
1   1.28 1.38 1.54 1.77 2.05 2.30 2.48 2.41 2.36 1.73 1.38 1.17
2   1.46 1.77 2.05 2.15 2.05 2.05 2.10 2.17 2.14 1.96 1.60 1.43
3   1.60 1.81 2.00 2.17 2.25 2.26 2.24 2.20 2.10 1.92 1.74 1.60