Erratum: Mechanics of tunable helices and geometric frustration in biomimetic seashells Qiaohang Guo, Zi Chen, Wei Li, Pinqiang Dai, Kun Ren, Junjie Lin, Larry A. Taber and Wenzhe Chen EPL, 106 1 (2014) 19902 Published online: 11 April 2014 DOI: 10.1209/0295-5075/106/19902