Extrapolation results for (a) lattice and (b) angular anisotropies. Extrapolating to with a linear least-squares fit to the curves in Figure 1 shows excellent convergence of to the expected value of . Good values should occur when the curves are flattest, which happens roughly around 0.25. A more robust fitting procedure could be used, but the accuracy of these results implies that it is unnecessary. The horizontal lines at provide a guide for the eye.