Examples of the maximum inscribed rectangle in the interior part of CHs (red box) and the convex hull area (the area included inside the yellow lines of each structure). Panel a: very fragmented and patchy CH with a maximum inscribed rectangle = 1.08 × 10¹⁰ km², a convex hull area = 31.69 × 10¹⁰ km², and Solidity = 0.03. Panel b: more compact CH with a maximum inscribed rectangle = 0.49 × 10¹⁰ km², a convex hull area = 1.87 × 10¹⁰ km², and Solidity = 0.26.