The Na-O anticorrelation in horizontal branch stars (Corrigendum) - II. NGC 1851R. G. Gratton, S. Lucatello, E. Carretta, A. Bragaglia, V. D’Orazi, Y. Momany, A. Sollima, M. Salaris and S. CassisiA&A, 547 (2012) C2DOI: https://doi.org/10.1051/0004-6361/201118491e