Erratum to: Transverse polarization of top quarks produced in e + e −-annihilation at O(α s ) S. Groote and J.G. Körner Eur. Phys. J. C, 70 1-2 (2010) 531 Published online: 24 September 2010 DOI: 10.1140/epjc/s10052-010-1439-7