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Fig. 3
CDS irradiances (boxes) for chromospheric and lower-transition region lines at 1 AU (108 phot cm-2 s-1). The CDS irradiances are compared with the CDS/ rocket EGS measurements of May 1997 by Brekke et al. (2000) [asterisks], the TIMED SEE EGS [triangles] and the SDO/EVE prototype spectrum of 2008 April 14 [diamond].
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