Dr. J. Lean kindly provided us with her compilation of the observed UV spectral irradiance variations, which we gratefully acknowledge. We are also grateful to CCP7 for the provision of a UNIX version of ATLAS. YCU would like to acknowledge support through the Fond zur Förderung der wissenschaftlichen Forschung under grant S7302-AST. The work of MF was supported by the Schweizerische Nationalfonds under grant No. 21-40428-94.
© European Southern Observatory (ESO) 1999
Online publication: April 19, 1999