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From the same paper as the previous image.
The critical buckling mode under a compressive axial load applied to the central nozzle, which is replaced by a rigid segment in the finite element model, corresponds to n = 1 circumferential wave (tilting).
b) shows a profile view of the n = 1 buckling mode.
c) shows the buckling mode under axial tension applied to the central nozzle. The critical buckling mode in this case has about 9 circumferential waves (n = 9). This buckling mode is analogous to that shown 2 images ago.
Since the central nozzle axial load is applied along the axis of revolution, the pre-buckling state of the shell is axisymmetric.
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