Viscosity of isotropic system

GROMACS version: 5
GROMACS modification: No
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I have a anisotropic system and I am trying to obtain shear viscosity from ‘tcaf’ method.
Is the result I get in this method using Gromacs is the ‘‘averaged’’ viscosity? or the obtained viscosity depends on the isotropicity I have applied (uniform electric filed to the system in one direction)?

thanks for answer