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           none | dataset name 
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           Active when method equals twopoint, this property contains the coordinates of the two points in the two rows of the matrix. 
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           twopoint | pointdir 
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           symmetric | antisymmetric 
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           none | dataset name 
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           threepoint | pointnormal 
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           Active when planetype equals general, this property indicates whether the plane should be specified by three points or through one point and a normal. 
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           Active when method equals threepoint, this property contains the coordinates of the three points in the rows of the matrix. 
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           quick | general 
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           If hasvar is true: The name of the positive side variable, which is 1 on the side where the original data resides and 0 on the other side. 
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           If hasvar is true: The names of space variables, which evaluate to the coordinates after the transformation performed by the mirror dataset. 
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