Example of decayless kink waves observed in AR12957 on 2022 March 04. Panel b shows a magnified image of the loops in panel a. The boxes S1 to S3 indicate the slits along which the temporal evolution is shown in the form of space-time diagrams in panels c to e. To enhance the appearance of the oscillating threads in these space-time diagrams, a smooth version of the map (boxcar-smoothed in the vertical direction) is subtracted from each original map. The black lines represent fits for the oscillation of the loops (see Sect. 3.1.1 for details).