[LORENE] grv2 Newtonian

[Reinhard Prix]

Hi,

if I understand this correctly, the '2D-viriel'-error grv2() is
meaningless in the Newtonian case (I suppose the corresponding
2D-Poisson equation is not actually solved in that case?).

If this is so, would it not be better (for clarity) to set 
grv2 -> 0  in the non-relativistic case?

Best,
Reinhard

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