Average magnetic moment of <i>M. magneticum</i> AMB-1 cells measured by six different methods.

± s.e.m for measurements on multiple cells.a Mean b Value and error returned by least-square fitting of data. ± standard deviation from alternate forms of the same general method (e.g. assuming either two-dimensional or three-dimensional trajectories).c Value returned by least-square fitting of the data assuming two-dimensional trajectories