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Table 1
Observational information.
| Star | ST | Period | V | Nb. | |
| [d] | |||||
|
|
|||||
| DH Cep | O5.5V-III+O6V-III | 2.11095 | 8.61 | 11 | |
| V382 Cyg | O6.5V((f))+O6V((f)) | 1.88555 | 8.65 | 10 | |
| Y Cyg | O9V+O9.5V | 2.99633 | 7.32 | 9 | |
| V478 Cyg | O9.5V+O9.5V | 2.88086 | 8.68 | 10 | |
| XZ Cep | O9.5V+B1III | 5.09725 | 8.51 | 6 | |
| AH Cep | B0.2V+B2V | 1.77473 | 6.88 | 15 | |
Notes. The table includes: target name, spectral type, period, V magnitude, and number of spectra (Nb) obtained for each system.
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