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Fig. 4


Top: extinction distribution of the new classified OB type stars earlier than B3 in Cygnus OB2 and boundaries. Gray indicates B-type stars while dark gray are O-type stars. Bottom: green indicates all the confirmed stars in the Cygnus region, which includes Cyg OB2, Cyg OB9 and field. Red indicates only those new OB stars located in Cygnus OB2. Green and red dashed lines indicate the median values for the stars in the whole Cygnus region and only Cygnus OB2 respectively.

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