> This seems weird.  What kind of data set do you have?  Is your data set
> already centered then?  I'd think there'd be some roundoff error so that it
> wouldn't be exactly 0 but a "very small number".  Do you have any
> cells/what's the area result under the cell data?

Sorry, I should have specified this earlier. The data is a point
cloud. Each point has a vertex cell. The data set is far from
centered. Maybe this is the problem - there is no "area"? Here is the
data set: http://rpi.edu/~doriad/Paraview_List/data.vtp

Thanks for your help,

David
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