Table 1: Emission lines used in the present analysis. Transitions within 0.4 Å are blended in the CDS spectra. Wavelengths are from v4.2 of the CHIANTI database.

Ion
Transition $\lambda $

Mg V
2s2 2p4 3P2-2s 2p5 3P2 353.09
  2s2 2p4 3P1-2s 2p5 3P1 353.30

Mg VI
2s2 2p3 2D5/2-2s 2p4 2D3/2 349.11
  2s2 2p3 2D3/2-2s 2p4 2D3/2 349.12
  2s2 2p3 2D5/2-2s 2p4 2D5/2 349.16
  2s2 2p3 2D3/2-2s 2p4 2D5/2 349.18

Mg VII
2s2 2p2 3P2-2s 2p3 3P2 367.66
  2s2 2p2 3P2-2s 2p3 3P1 367.67

Mg VIII
2s2 2p 2P3/2-2s 2p2 2P3/2 315.02

Ne IV
2s2 2p3 4S3/2-2s 2p4 4P5/2 543.89

Ne V
2s2 2p2 3P2-2s 2p3 3D1 572.03

Ne VI
2s2 2p 2P3/2-2s 2p2 2D3/2 562.70
  2s2 2p 2P3/2-2s 2p2 2D5/2 562.80

Ne VII
2s 2p 3P1-2p2 3P1 561.38
  2s 2p 3P2-2p2 3P2 561.73

Si IX
2s2 2p2 3P1-2s 2p3 3D1 344.95
  2s2 2p2 3P1-2s 2p3 3D2 345.12
  2s2 2p2 3P2-2s 2p3 3D1 349.62
  2s2 2p2 3P2-2s 2p3 3D2 349.79
  2s2 2p2 3P2-2s 2p3 3D3 349.86

Mg IX
2s2 1S0-2s 2p 1P1 368.07

Mg X
2s 2S1/2-2p 2P1/2 624.94

Si XII
2s 2S1/2-2p 2P1/2 520.67


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