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Abstract
It is shown that the initial slope of the mid-plane tilt angle of a nematic TN-cell correlates well with the associated optical slope for a given cell. Upon determination of the mid-plane tilt angle from the physical parameters of the liquid crystal and the cell-specific correlation coefficients it is easily possible to estimate the optical slope for any material. Cell performance can be optimized qualitatively in terms of the elastic constants, the dielectric anisotropy, and the twist angle.