(Top left): damping time of 101 kink oscillations of coronal loops plotted against the loop length. The linear fit of the data passing through the origin is shown by the solid gray line with a gradient of 0.049 ± 0.001. (Top right): damping time of 101 kink oscillations of coronal loops plotted against the period. The linear fit of the data passing through the origin is shown by the solid gray line with a gradient of 1.79 ± 0.14. (Bottom left): the apparent amplitude of 221 kink oscillations of coronal loops plotted against the period. (Bottom right): quality factor of 101 kink oscillations of coronal loops plotted against the oscillation amplitude. The inset shows the same dependence in the log–log plot. The dotted and dashed curves show the approximation of the upper-right boundary of the data clouds with a linear function in the log–log plot and the corresponding power-law function in the linear plot, respectively.