Table 2: Identification of the lines used in this study.
Line Transition Wavelength Lines comprised in
    $\mu$m EW measurement
Pa$\beta$ 3-5 1.2822 He II (6-10) $\lambda$1.2816
      He I (3p-5s) $\lambda$1.2849
      He I (3d-5f) $\lambda$1.2788
      C III  $\lambda$1.2794
Pa$\gamma $ 3-6 1.0941 He II (6-12) $\lambda$1.0936
      He I (3d-6f) $\lambda$1.0916
      C III  $\lambda$1.0920
Br$\alpha$ 4-5 4.0523 He II (8-10) $\lambda$4.0506
      He I (4f-5g) $\lambda$4.0409
      He I (4f-5g) $\lambda$4.0377
Br$\gamma $ 4-7 2.1661 He II (8-14) $\lambda$2.1652
Br 10 4-10 1.7367  
Br 11 4-11 1.6811  
Pf$\gamma $ 5-8 3.7406  
Pf 9 5-9 3.2970  
Pf 10 5-10 3.0392  
He II 5-7 1.1630  
He II 6-7 3.0917 He II (8-11) $\lambda$3.0955
      C III  $\lambda$3.0878
      C III  $\lambda$3.0843
      C III  $\lambda$3.0763
He II 6-11 1.1676  
He II 7-10 2.1891  
He II 7-12 1.6923  
He II 7-13 1.5722  
He I 2s-2p 2.0587  
He I 3p-4s 2.1126  
He I 3p-4s 2.1138  
He I 3p-4d 1.7007  
He I 3p-5d 1.1972  
He I 3d-5f 1.2788  
He I 4p-5d 3.7036  
C IV 3d-3p 2.0802  
C III 7-8 2.1151  


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