Fig. 2

Comparison of Gradient index results with three different margins around the target. a GI with a 3 mm margin, b GI with a 5 mm margin, and c GI with a 10 mm margin
Comparison of Gradient index results with three different margins around the target. a GI with a 3 mm margin, b GI with a 5 mm margin, and c GI with a 10 mm margin