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The coordinate systems and angles used to describe the model of plant tissue. ZLAB denotes the z-axis of the laboratory frame. θ is the angle between the external magnetic field and the Z0-axis chosen as an axis of the sample in the experiment. ζ and ξ are the polar and azimuthal angles characterizing the deviation of the main ZC -axis of an elongated nano-cavity from the Z0-axis of the sample.
