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• 22:44, 30 March 2023 Eldond talk contribs created page File:Cross section 1shift 2elong 3triang 4square.png (Illustration of the m=1,2,3, and 4 tokamak plasma cross section shape perturbations: m=1 is the Shafranov shift, which displaces the center of a flux surface from the nominal geometric center of the LCFS, m=2 is elongation, which stretches the plasma vertically, m=3 is triangularity, which is increased by pulling the X-points to smaller R, and m=4 is squareness.)