Corrigendum: Freely orbiting magnetic tweezers to directly monitor changes in the twist of nucleic acids

directly monitor changes in the twist of nucleic acids Jan Lipfert, Matthew Wiggin, Jacob W.J. Kerssemakers, Francesco Pedaci & Nynke H. Dekker Nature Communications 2:439 doi: 10.1038/ncomms1450 (2011); Published 23 Aug 2011; Updated 27 May 2015 The published version of this article contains two errors. In equation (18), there is a typographical error in the second term; it should read Rcircle 2 Rbead instead of RcircleRbead 2 . The corrected version of equation (18) reads as follows: gy 8pZRbead 1 1=8 ð Þ Rbead=D ð Þ þ 6pZR 2 circleRbead 1 9=16 ð Þ Rbead=D ð Þþ 1=8 ð Þ Rbead=D ð Þ ð18Þ In addition, the y axis of the plot in Fig. 3f was incorrectly scaled. A corrected version of Fig. 3 is shown below. Neither of these errors affects any of the conclusions in the paper, as all calculations were based on the correct power spectrum and the correct version of equation (18). We apologize for any confusion that these errors might have caused.