AIA 171 and 94 Å difference images showing frontal loops (left panel) enclosing the expanding FR (middle). The right panel shows the AIA 304 Å difference image with the erupting ELS2 rotating in the counterclockwise direction. S1–S3 are the slits used to generate the stack plots shown in Figure 13. The x- and y-axes in each image are in arcseconds.