Erratum to: Dispersive analysis for C. Hanhart, A. Kupść, U.-G. Meißner, F. Stollenwerk and A. Wirzba Eur. Phys. J. C, 75 6 (2015) 242 Published online: 03 June 2015 DOI: 10.1140/epjc/s10052-015-3429-2