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∗ The experimental values include also terms of higher orders in m/M . 

like systems. Most accurate results for lithium are presently obtained utilizing variational solutions of the three-body Schr¨ odinger problem and accounting for the relativistic and QED corrections within the αZ expansion [43, 44]. We use these results to estimate the residual correlation effects in our calculations. Analyzing the convergence of the calculated atomic properties as a function of the configuration basis set, the difference between the results obtained by two alternative methods described above, and the deviation of our nonrelativistic 

