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questions about the adequacy of the primary device used in these measurements, the Robertson-Berger meter. The measurements require not only accurate absolute radiometry, but also high wavelength resolution and accuracy, because the ozone absorption spectrum at the edge of the Hartley band is so steep. The spectral intensity of solar radiation received at Earth drops by eight orders of magnitude in the spectral band from 300 to 280 nm. The data from the existing ground based network probably lack adequate calibration stability, limiting their suitability for trend analyses.



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