Meridional slices of the nonaxisymmetric latitudinal magnetic field, ${\stackrel{\sim }{B}}_{\theta }\prime$, during the linear growth phase of the instability for six simulation runs of subset 1 in Fig. 9, spanning different values of the stratification parameter ${\overline{\delta }}_1$. WKB-type modes are identified for ${\overline{\delta }}_1\le 54$, while global modes emerge for ${\overline{\delta }}_1\ge 130$. The leftmost panel corresponds to the unstratified run TU0 described in Sect. 3.4.1.