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Table 2

Main diagnostics used in our spectral fitting process.

Parameter O stars Early B stars Late B stars
T* He I/He II line ratios Si III/Si IV line ratios Si II/Si III, Mg II/He I line ratios
log g* Hγ and Hδ line wings Hγ and Hδ line wings Hγ and Hδ line wings
Hα, He II 4686, Si IV 1393–1403 Hα, He II 4686, Si IV 1393–1403 Hα, He II 4686, Si IV 1393–1403
P V 1118–1128, C IV 1169, C III 1176 C IV 1548–1551
C IV 1548–1551
v Hα, N V 1238–1242, C IV 1548–1551 Hα, C IV 1548–1551 Hα, Si IV 1393–1403
Si IV 1393–1403, P V 1118–1128 Si IV 1393–1403
v sini He I lines, N III 4510–4525 He I lines, N III 4641 He I lines, C II 4267
Si IV 4089–4116 Si III 4552–4575, O II 4649 Mg II 4481
vrad He I and He II lines He I lines, Si III 4552–4575 He I lines, C II 4267, Mg II 4481

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