Example of a synthetic vortex and the corresponding detected vortex by ASDA. (a) Velocity field of the region (green arrows) and the synthetic vortex edge (black dashed circle) with center C (black text) and radius r (black arrow and text). The edge and center of the detected vortex are shown as blue solid curves and a blue point (C_d), respectively, with effective radius r_d (blue text and arrow). The effective edge (blue dashed circle) is determined by the effective radius r_d. The background shows the distribution of Γ₁. (b) Same as panel (a) but with the background showing the distribution of Γ₂.