Time-slice diagrams of S2 (left panel) and S3 (right panel) in 171 Å using the AIA base-difference images. s = 0 Mm represents the left endpoints of S2 and S3. The dark pre-flare dimmings and twin dimmings are pointed out by the black arrows in each panel. The white double-headed arrows denote the apparent widths of the pre-flare dimmings along S2 and S3.
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