Viscosity of anisotropic system

Hi

I have a anisotropic system and I am trying to obtain shear viscosity from ‘‘MOMENTUM FLUCTUATIONS’’ method, explained in Berk Hess paper, JOURNAL OF CHEMICAL PHYSICS
VOLUME 116, NUMBER 1, 2002.
Is the result I get is averaged viscosity?

GROMACS version: 5
GROMACS modification: Yes/No
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