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Schematic of the elliptical annulus used for data sampling within the 6mm × 6mm Cirrus HD-OCT Macular Cube 200×200 scan. The annulus has an inner vertical radius of 0.5mm and an outer vertical radius of 2mm, stretched horizontally by 20%. ST = supero-temporal; S = superior; SN = supero-nasal; IN = infero-nasal; I = inferior; IT = infero-temporal.
