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Fig. 4

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Dispersion curves of kink waves propagating along a twisted magnetic flux tube at η = 2, Be/Bi = 0, Biφ/Bi = 0.4, and MA = 0. The green curve is the dispersion curve of the wave associated with the kink speed ck. The purple curves depict all 11 dispersion curves; 9 of them are divided into two sub-groups. The “evolution” of those curves when increasing kza can be seen in the next figure, which shows them near the left top and right bottom corners of the plot.

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