  The influence of periodic boundary conditions (implicit finite-size effects)
on the anisotropy of pair correlations in computer simulations is studied for a
dense classical fluid of pair-wise interacting krypton atoms near the triple
point. Molecular dynamics simulation data for the pair distribution function of
N-particle systems, as a function of radial distance, polar angle, and
azimuthal angle are compared directly with corresponding theoretical
predictions [L. R. Pratt and S. W. Haan, J. Chem. Phys. 74, 1864 (1981)]. For
relatively small systems of N=60, 80, and 108 atoms, significant angular
variation is observed, which is qualitatively, and in several cases
quantitatively, well predicted by theory. Finite-size corrections to the
spherically-averaged radial distribution function, however, are found to be
comparable to random statistical errors for runs of 10^5 time steps.
