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           none | dataset name 
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           The index of the solution to use, per level, or interp, but only for transient solutions. Available when data is not parent and the underlying data has multiple solutions. 
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           sparse | filled 
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           Method for doing the parameter variation. For sweeptype = sparse, the parameter tuples defined by the columns in plistarr are solved for. This method requires equal length for the rows. For sweeptype = filled, all parameter combinations given by plistarr are solved for. 
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           The units to use for the expressions in expr. If the old unit is not valid when the expression changes, the unit property is reset to default. 
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