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Vr = -3000 km/s. l H a ≈ 6580 Å. Vr = 0 km/s. 3000 km/s. l H a ≈ 6563 Å. Vr = + 3000 km/s. l H a ≈ 6510 Å. observateur.
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Vr = -3000 km/s l Ha ≈ 6580 Å Vr = 0 km/s 3000 km/s l Ha ≈ 6563 Å Vr = + 3000 km/s l Ha ≈ 6510 Å observateur