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a



























                                                         b

                            Figure 1.12. Average quarterly global isoflux contours of total insolation per day in
                                2
                                                                        2
                                                            2
                            MJ/m  falling on a horizontal surface (1 MJ/m  = 0.278 kWh/m ). (a) March
                            quarter, (b) June quarter (Used with permission of the authors, Meinel & Meinel,
                            1976).











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