Period plotted against loop length for 118 kink oscillations of coronal loops. The solid black line corresponds to an unweighted linear fit of the data. The best fitting linear function is P [min] = (0.025 ± 0.001) L[Mm], giving a kink speed of Ck = (1330 ± 50) km s-1 from the gradient. The dashed lines correspond to kink speeds of 800 and 3300 km s-1 for the upper and lower lines, respectively.
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