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Table 2

Main diagnostics used in our spectral fitting process.

Parameter UV lines Optical lines

T He i/He ii, N iii/N iv/N v line ratios

log g Hγ and Hδ line wings

N v 1238–1242, C iv 1548–1551 Hα, He ii 4686 emission
N iv 1718, O iv 1338–1343, He ii 1640
P v 1118–1128, C iv 1169, C iii 1176

ν N v 1238–1242, C iv 1548–1551 Hα line width
Si iv 1393–1403, N iv 1718
P v 1118–1128, C iv 1169, C iii 1176 blue edge

D P v 1118–1128, N iv 1718, O v 1371 Hα

ν sini N iii 4640–4642, N iv 4058
Si iv 4089–4116, He i 4388

Abundances C iii 4647–4650–4651, Si iv 4089–4116
O ii 4649, O ii 4070, N iii 4510–4525, N v 4620

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