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(a) 4-Pulse ELDOR sequence. (b) Relation between the dipolar coupling ωdd and the spin–spin distance rAB. μ0 is the vacuum permeability, γ are the magnetogyric ratios of the spins A and B, ħ is the Planck's constant divided by 2Π and θAB is the angle between rAB and the external magnetic field. (c) Plot of the Tikhonov regularization and of the corresponding PELDOR time trace (inset) for RNA 3 and (d) for RNA 4.
