Fig. 1.

Percentage deviations between the present energy levels (horizontal lines in black), the experimental ones (NIST) and other theoretical values as available in archival databases (MCHF, OPEN-ADAS) and previous works: F16 refers to Fernández-Menchero et al. (2016), E14 refers to Ekman et al. (2014), L11 refers to Liang et al. (2011), G00 refers to Griffin & Badnell (2000, OPEN-ADAS), and T17 refers to Tayal & Zatsarinny (2017).
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