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The geometry of the cylinders. The center-to-center pitch between the cylinder is denoted as P. The distance between the cylinders may also be defined by the longitudinal spacing L and the transverse spacing T. The roll angle of the cylinders is denoted as α. The configuration α = 0° is referred as tandem; α = 90° is referred as side-by-side; staggered corresponds to α = 45°.
