Scatter diagrams for initial velocities vs. heights of first appearance of the ARS blobs (left panel) and of the QES blobs (right panel). Each blue circle represents an individual blob. A black diamond shows the average value obtained in a segment of 0.4 R_⊙ (marked by the dashed red line), and the error bar in black denotes the 1σ error. The solid green line shows a linear fit to the segmented average values vs. height, which gives y = 17.2x + 5.7 for the left panel and y = 18.9x − 5.5 for the right panel.