Ubiquitous QSEB detections using the k-means clustering technique. (a) Observed FOV in the Hβ blue wing. The red contours indicate the location of QSEBs. (b) Co-temporal continuum WB image. (c–f) Zoom-in on the four different areas indicated by the white boxes in (a); each panel shows duplicate images, one with the red contours indicating the location of QSEBs and one without the contours. The arrow in panel b shows the direction of the closest solar limb. An animation of this figure is available online.