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Percentage deviations between the energy levels used here (horizontal lines in black), the experimental levels (NIST), and previous works: B08 refers to Butler & Badnell (2008), L10 refers to Ludlow et al. (2010), L11 refers to Liang et al. (2011), S14 refers to Sossah & Tayal (2014), T15 refers to Tayal & Sossah (2015), W17 refers to Wang et al. (2017), and M11 refers to McLaughlin et al. (2011).
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