Sign ambiguity in the KΣ channelA. V. Anisovich, E. Klempt, V. A. Nikonov, A. V. Sarantsev and U. ThomaEur. Phys. J. A, 49 12 (2013) 158DOI: https://doi.org/10.1140/epja/i2013-13158-8