摘要:Scientific Reports 5 : Article number: 10768 10.1038/srep10768 ; published online: 11 June 2015 ; updated: 21 September 2015 This Article contains a typographical error in Fig. 3a, where ‘ L F = β· L ’ should read ‘ L F = (α + β) · L ’. The correct Fig. 3a appears below as Fig. 1 .