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Table 1.

ESO spectra used in this work, in which the star ID, spectral type (from the literature), instrument, and ESO programs are indicated.

ID SpType (literature) Instrument ESO-Program
HD 93129A O2 If* FEROS 079.D-0564(A)
HD 93162 O2.5 If*/WN6 FEROS 0102.A-9010(A)
LH 114-7 O2 III(f*)+O V XSHOOTER 106.211Z
HD 269810 O2 III(f*) UVES+XSHOOTER 70.D-0164(A)+106.211Z
BRRG56 O2 III(f*) UVES+XSHOOTER 074.D-0109(A)+084.D-0142(A)
Sk-68 137 O2 III(f*) XSHOOTER 106.211Z
BI237 O2 V((f*)) UVES+XSHOOTER 074.D-0109(A)+106.211Z
BI253 O2 V((f*)) UVES+XSHOOTER 074.D-0109(A)+106.211Z
VFTS506 ON2 V((n))((f*)) XSHOOTER 106.211Z
HD 64568 O3 V((f*))z FEROS 096.A-9039(A)
BRRG48 O3 V((f*))z XSHOOTER 106.211Z
HD 93128 O3.5 V(f+) FEROS 086.D-0997(A)
HD 93129B O3.5 V(f+) FEROS 089.D-0975(A)
HD 93250 O4 III FEROS 073.D-0609(A)
HD 168076 O4 III FEROS 077.D-0146(A)
HD 46223 O4 V((f)) FEROS 086.D-0997
MSP183 O3 V((f)) XSHOOTER 095.D-0843(A)
VPHAS-OB1-1338 O4 V XSHOOTER 095.D-0843(A)
VPHAS-OB1-1273 O4 V XSHOOTER 095.D-0843(A)

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