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Fig. 7
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Differences in irradiance from a blackbody: (a) theoretically as a gain by passing from [1,000; 2,500 nm] to [780; 3,000 nm] integral wavelength range, (b) in practice as a loss due to air absorbency above 2,500 nm , as measured in front of a metal melting furnace at 1,200 °C (image from CR5).
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