Sunspot group tilt angles and the strength of the solar cycle (Corrigendum) M. Dasi-Espuig, S. K. Solanki, N. A. Krivova, R. Cameron and T. Peñuela A&A, 556 (2013) C3 Published online: 05 August 2013 DOI: 10.1051/0004-6361/201014301e