Convergence of Theory and Experiments for the 3C/3D Line Ratio in Ni XIX*

We report the results of a new Dirac {\sl R}-matrix calculation for the 3C/3D X-ray line ratio in Ni\ {\small XIX}, together with the results of new experimental measurements performed on an EBIT. The results and uncertainties were obtained independently at the Harvard-Smithsonian Center for Astrophysics and NIST, respectively, and agree well with each other. The theoretical results are converged to an uncertainty of $\sim$5\%.