The role of the Fraunhofer lines in solar brightness variability A. I. Shapiro, S. K. Solanki, N. A. Krivova, R. V. Tagirov and W. K. Schmutz A&A, 581 (2015) A116 Published online: 18 September 2015 DOI: 10.1051/0004-6361/201526483