Comparisons of our MBPT wavelengths for Δn ≠ 0 E1 transitions among singly excited levels for Z = 10,14,18,22,26,30 with other theoretical values, i.e., our MCDHF results (bar), values from Savukov et al. (2003; plus) and Aggarwal et al. (2005, 2009, 2010, 2012d, 2013a; cross). As Aggarwal et al. did not provide values for Z = 10, the differences between our MBPT energies and those of Aggarwal et al. for Na IX are plotted instead.
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