<p>
g_tcaf computes tranverse current autocorrelations.
These are used to estimate the shear viscosity eta.
-For details see: Palmer, JCP 49 (1994) pp 359-366.<p>
+For details see: Palmer, Phys. Rev. E 49 (1994) pp 359-366.<p>
Transverse currents are calculated using the
k-vectors (1,0,0) and (2,0,0) each also in the y- and z-direction,
(1,1,0) and (1,-1,0) each also in the 2 other planes (these vectors