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              <p>The k-distribution method and the correlated-k approximation of Kato et al. (1999) are a smart approach designed for calculations of the broadband solar radiation at ground level by using only 32 spectral bands. This communication presents a preliminary assessment of the performance of this approach compared to more detailed spectral calculations for the spectral intervals no. 3 [283, 307] nm to no. 26 [1613, 1965] nm for clear and cloudy situations. For spectral intervals no. 5 [328, 363] nm to no. 26, the relative errors are less than 5% of the irradiance in the corresponding interval. The irradiance is strongly underestimated in the spectral intervals no. 3 and no. 4 [307, 328] nm. It is found that if necessary, errors may be accurately corrected with simple models computed only once.</p>
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