Table 1: Observational details and target properties. The spectral types, intrinsic colours and reddenings are discussed in Sect. 4.2.
Target ID: AzV 456 AzV 18 AzV 214 AzV 398 AzV 65   AzV 242
  Sk 143 Sk 13     Sk 33 Sk 191 Sk 85
Setting 390+564              
exposure time (s) 7200 3200 3400 9000 1200 3100 7700
observing date (d/m/yr) 27/9/01 5/8/03 x 5/8/03 x 31/7/03 x 1/8/03 x 27/9/01 27/9/01
Setting 346+580              
exposure time (s)   5550         6600
observing date (d/m/yr)   25/9/01         26/9/01
Setting 437+860              
exposure time (s)   4860         2230
observing date (d/m/yr)   24/9/01         24/9/01
Spectra type [Sect. 3.2] O9.5I 4, 5, 6, 7 B2Ia6, 7 B2Ia6 O9.7Ia6 B6Ia-B8Ia7 B1.5Ia7 B1Ia7
V (mag) [1] 12.888 12.420 13.416 13.889 11.03 [3] 11.86 [3] 12.11 [2]
B-V (mag) [1] 0.109 0.041 0.038 0.100 0.13 [3] -0.04 [3] -0.13 [2]
(B-V)0 [Sect. 4.2] -0.25 -0.19 -0.19 -0.24 -0.02/-0.06 -0.18 -0.19
EB-V [Sect. 4.2] 0.35 0.23 0.23 0.35 0.15/0.19 0.14 0.06
EB-V SMC [a] 0.31 0.19 0.19 0.31 0.11/0.15 0.10 0.02
EB-V SMC [b] 0.26 0.18 0.16 0.30 0.08/0.12 0.05 0.03
EB-V SMC [c] 0.22 0.15 0.14 0.26 0.08/0.12 0.06 0.03
EB-V SMC [d] 0.29 0.16 0.13 0.28 0.06/0.10 0.03 0.00
EB-V SMC [e] 0.27 $\pm$ 0.07 0.17 $\pm$ 0.03 0.16 $\pm$ 0.05 0.29 $\pm$ 0.04 0.08 $\pm$ 0.04/0.12 0.06 $\pm$ 0.05 0.02 $\pm$ 0.02
[AzV] catalogue: Azzopardi & Vigneau (1982); [Sk] catalogue: Sanduleak (1968, 1969). [1] Gordon et al. (2003); [2] Danforth et al. (2002) (D02); [3] Wayte (1990) (W90); [4] Evans (2004; 2dF survey) [5] Evans et al. (2004a); [6] Optical/UV spectral type by Gordon & Clayton (1998); [7] Lennon (1997); [8] Nandy et al. (1990); [a] MW (Milky Way) foreground reddening is assumed to be 0.04 mag (Sect. 4.2.1). [b] MW and SMC sodium column densities contribute proportionally to the total observed reddening (Sect. 4.3). [c] MW and SMC sodium column densities contribute to the total observed reddening according to N(Na I) = 1.7 $\times $ 1014  \ensuremath {{E_{B-V}}}1.8 (Hobbs 1974b), Sect. 4.3. [d] MW foreground reddening is derived via the relation between N(Na I) and \ensuremath {{E_{B-V}}} given in [c] and substracted from the total observed reddening (Sect. 4.3). [e] Average EB-V SMC from methods [a] to [d]. [x] UVES with image slicer #1.

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