Evolution of the KHI at the boundary of the jet and coronal plumes in the EUI 174 Å observations. (a-c, g-i): Development of ruffles at the interface between the jet and coronal plumes from 06:00:17 UT to 06:00:57 UT. The dashed lines in blue outline the boundary of the distortions of the ruffles, the ruffle marked with red arrow in panel (i) is used for estimating the growth rate of the KHI in Figure 2d in the main text. (d-f, j-l): Development of ruffles at the interface between the jet and coronal plumes from 06:00:17 UT to 06:00:57 UT with a Sobel enhancement. Associated animation from 05:58:52 UT to 06:05:32 UT could be obtained online. The real-time duration of the animation is 16 s.