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| W# | Spectral classification | ||||||
| 1966 | 1973 | 1973-4? | 1981 | 1995 | 2002 | 2006 | |
| 4 | OB | OB | - | G0 Ia | OB | F2 Ia | <G5 Ia |
| 6 | OB | - | - | B1 V | - | B0.5 Iab | - |
| 7 | OB | OB | - | A0 Ia | OB | B5 Ia | - |
| 8a | OB | - | - | G0 Ia | OB | F5 Ia | <G5 Ia |
| 9 | OB | ? | ? | Be | OB | sgB[e] | <G5 Ia |
| 10 | OB | - | - | B0 III | - | B0.5I+OB | - |
| 11 | OB | - | - | B1 II | - | B2 Ia | - |
| 12a | OB | OB | - | A2 Ia | OB | A5 Ia | <G5 Ia |
| 16a | OB | OB | - | A2 Ia | OB | A2 Ia | - |
| 20 | M | M | M | M6 Ia | - | <M6 I | M5 Ia |
| 26 | M | M | M | M2 Ia | M | <M6 I | M5-6Ia |
| 28 | OB | - | - | B0 II | - | B2 Ia | - |
| 31 | OB | - | - | Be | - | B0I+OB | - |
| 32 | OB | OB | - | G5 Ia | OB | F5 Ia | <G5 Ia |
| 33 | OB | - | - | B8 Iab | OB | B5 Ia | - |
| 70 | OB | - | - | B8 Iab | - | B3 Ia | - |
| 71 | OB | - | - | B8 Iab | - | B2.5 Ia | - |
| 75 | M | M | M | - | - | - | M4 Ia |
| 78 | OB | - | - | B1 Ia | - | B1 Ia | - |
| 237 | M | M | M | M6 | - | <M6 I | M3 Ia |
| 243 | OB | OB | - | B2Ia | - | A2 Ia | - |
| 265 | OB | OB | - | G0 Ia | - | F5 Ia | <G5 Ia |
Notes. Note that classifications given in italics have been
derived from photometric data alone, while the 2006 classifications are
derived from 2.3 
m spectroscopy (Mengel & Tacconi-Garman 2007, 2008). Crowther et al. (2006) provide a comparable table for the WR population.
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