[Paraview] display curved surfaces on 20-noded hex element

[Tim Kostka]

I have a number of quadratic 20-noded hex elements (type 25 in ParaView).  I
want the surfaces to be displayed as curved instead of being arbitrarily
faceted.  Is there a method to achieve this?  I've attached a picture of a
single element which is faceted and the corresponding vtu file.

Thanks,
Tim
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