Tayler instability in run U4 and comparison with local linear analysis predictions. (a) Meridional cut and (b) surface projection of the nonaxisymmetric azimuthal field at time t − t_pert = 3.5 during the linear phase of the instability growth. The surface projection is taken at radius r/r_o = 0.7, which is indicated by the dashed line in (a). (c) Axisymmetric azimuthal field at the perturbation time t_pert = 33.2. (d) Theoretical TI growth rate . The gray shaded areas show the locations where the instability condition (A.1) for the m = 1 mode and the axisymmetric azimuthal field solution in (c) is fulfilled.