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           none | dataset name 
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           When method is twopoint: The coordinates of two points on the symmetry axis. Available for Sector3D. 
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           If true, spacevars are made available for evaluation. 
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           all | manual 
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           twopoint | pointdir 
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           If sectors is odd or trans is rot: The azimuthal mode number use to transform the solution’s phase between sectors. 
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           If trans is rotrefl: The direction in which the reflection axis/plane (for 2D and 3D respectively) points. 
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           rot | rotrefl 
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           If sectors is even: Controls whether the transformation performed between consecutive sectors is rotation or rotation and reflection. 
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