Relative frequency histograms of the stars located at low (78.5°–79.5°), central (79.5°–80.5°) and high (80.5°–81.5°) Galactic longitudes in Cygnus OB2 using Geneva non-rotating (top) and rotating (bottom) models. Orange, purple and yellow colors indicate those stars located in the young (0–5 Myr), intermediate (5–10 Myr) and old (>10 Myr) age groups.
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