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3. ASTM, 2000. Solar Constant and Zero Air Mass Solar Spectral Irradiance Tables. Standard E490. American Society for Testing and Materials, West Conshohocken, PA. .
4. ASTM, 2003. Standard Tables for Reference Solar Spectral Irradiances: Direct Normal and Hemispherical on 37° Tilted Surface. Standard G173-03. American Society for Testing and Materials, West Conshohocken, PA. .
5. ASTM, 2014. Reference Solar Spectral Distributions: Direct and Diffuse on 20° Tilted and Vertical Surfaces. Standard G197–14. ASTM International.