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Table 2.

Spectral lines with their wavelength ranges, their central wavelengths and continuum regions that have been used for the calculation of their EWs, during the spectral line fitting.

Line ID Spectral line Continuum blue Continuum red
λcentral λstart λend λstart λend λstart λend
   (Å) (Å) (Å) (Å) (Å) (Å) (Å)
He I 4009 4004 4016 3990 4002 4035 4060
He I+He II 4026 4017 4034 3990 4002 4035 4060
Si IV 4088 4084 4091 4055 4075 4150 4170
H[[INLINE67]] 4100 4095 4110 4055 4075 4150 4170
Si IV 4116 4113 4118 4055 4075 4150 4170
He I 4121 4118 4125 4035 4060 4150 4170
Si II 4130 4125 4135 4035 4060 4150 4190
He I 4144 4140 4150 4035 4060 4150 4170
He II 4200 4190 4207 4150 4190 4245 4260
Fe II 4233 4229 4237 4205 4225 4238 4260
He I 4387 4382 4392 4365 4380 4398 4415
O II 4416 4412 4421 4398 4411 4440 4460
He I 4471 4462 4477 4440 4460 4495 4535
Mg II 4481 4477 4488 4440 4460 4490 4505
He II 4541 4537 4547 4510 4535 4590 4620
Si III 4553 4548 4558 4485 4507 4600 4620
O II+C III 4645 4635 4655 4600 4625 4660 4685
He II 4686 4679 4692 4660 4670 4730 4745

Notes. We used slightly different continuum bands for VFTS, LAMOST and GOSC surveys because the different spectral resolutions of each of them can cause the presence of undesirable spectral features within the predefined continuum regions, adding noise in the data. Here, we present the continuum regions that selected for LAMOST data since their population dominates among the other surveys. This is the final scheme of features that is used through this work, except for the H[[INLINE68]]/4100 Å spectral line, which is used only for the fit.

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