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Cygnus OB2 – a young globular cluster in the Milky Way

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Figure

Fig. 2. Differential J , H, and K PSC star counts for a square field of
Fig. 4. CMD of the Cyg OB2 association. The dashed line indicates
Fig. 5. Stellar density distributions derived from the 2MASS PSC catalogue (left) and DSS red plates (right)
Fig. 6. Radial star density distribution for stars earlier than spectral type
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