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Table 1
(b − y) colour transformation zeropoints.
| Observing run | Standard stars | zpt(b − y) |
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| Autumn 2008 | O stars | 1.3497 ± 0.0026 |
| Autumn 2008 | Cep OB3 | 1.3514 ± 0.0034 |
| Autumn 2008 | h & χ Per | 1.3413 ± 0.0025 |
| Autumn 2008 | NGC 6910/13 | 1.3566 ± 0.0021 |
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| Autumn 2008 | above combined | 1.3485 ± 0.0014 |
| Spring 2009 | NGC 1502, 2169, 2244 | 1.3916 ± 0.0037 |
| Autumn 2010 | Lac OB1, field | 1.3302 ± 0.0023 |
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