Table 3: Main features in the optical spectra. 1. identification of the ULXs; 2. observed wavelength; 3. spectral line identification; 4. redshift.

ID		 Spectral (Å) Identification Redshift
  feature    
IXO 29      
  5154 MgII($\lambda$2799 Å) 0.8415
  6866 OII($\lambda$3728 Å) 0.8414
  7126 NeIII($\lambda$3870 Å) 0.8415
  8960? H$\beta$ 0.8426
  9222 OIII($\lambda$5007 Å) 0.8413
IXO 43      
  4617 OII ($\lambda$3728 Å) 0.2384
  6022 H$\beta$ 0.2384
  6141 OIII($\lambda$4959 Å) 0.2381
  6203 OIII($\lambda$5007 Å) 0.2385
IXO 54      
  4646 MgII($\lambda$2799 Å) 0.6601
  6184 OII($\lambda$3728 Å) 0.6586
  6421 NeIII($\lambda$3870 Å) 0.6593
IXO 55      
  3380 OIV($\lambda$1402 Å)+SiIV($\lambda$1397 Å)  
  3735 CIV ($\lambda$1549 Å) 1.4109
  4603 CIII ($\lambda$1909 Å) 1.4114
  6758 MgII ($\lambda$2799 Å) 1.4146
IXO 56      
  3529 CIII($\lambda$1909 Å) 0.8491
  4574 OII($\lambda$2471 Å) 0.8511
  5178 MgII ($\lambda$2799 Å) 0.8503
  5901 HeI($\lambda$3189 Å)? 0.8507
  6890 OII($\lambda$3728 Å) 0.8463
  7153 NeIII($\lambda$3870 Å) 0.8468
IXO 57      
  5165 MgII($\lambda$2799 Å) 0.8453
  5914? HeI($\lambda$3189 Å)? 0.8546
  6910? OII($\lambda$3728 Å) 0.8538
  7175 NeIII($\lambda$3870 Å) 0.8540
IXO 70      
  3658 CIV($\lambda$1549 Å) 1.3628
  3863 HeII$\lambda$1640 Å) 1.3548
  4493 CIII($\lambda$1909 Å) 1.3535
  6545? MgII($\lambda$2799 Å) 1.3397
SW78      
  3358 CIV($\lambda$1549 Å) 1.1674
  4153 CIII($\lambda$1909 Å) 1.1760
  6126 MgII($\lambda$2799 Å) 1.1887


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