Small-scale dynamics in both upflow regions revealed in standard deviation maps and stack plots. (a) WOW-enhanced HRI_EUV image and artificial slits S1, S2, and S3 in the eastern upflow region on 2022 October 20. (b) Standard deviations of HRI_EUV image normalized by average. (S1–3) stack plots along slits S1, S2, and S3. Panels (c) and (d) are the same as panels (a) and (b), respectively, but for the western upflow region on October 26. Panels (S4–6) are stack plots along the slits S4–6 in panels (c) and (d). The vertical lines in the stack plots represent the observation time of HRI_EUV images in panels (a) and (c). Link to the Jupyter notebook creating this figure: 📘.