Helium signature in red giant oscillation patterns observed by Kepler M. Vrard, B. Mosser, C. Barban, K. Belkacem, Y. Elsworth, T. Kallinger, S. Hekker, R. Samadi and P. G. Beck A&A, 579 (2015) A84 Published online: 02 July 2015 DOI: 10.1051/0004-6361/201425064