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Logarithmic view of the deviation of Bull's eye based measurements from a complete set of FEM simulations; (a) is for the original design while (b) is for a Bull's eye design with half of the diameter. Simulations differ with respect to d33 and d31 where d33 is in pm/V and d31 is an index in a vector of d31 values with minimum -−d33/2 and maximum −d33/2 + 2.2 pm/V.
