Map of the source density with a dereddened K band (2 μm) magnitude lower than 13. The linear scale is given as a slider on the right and is expressed in number of sources per arcmin2. The Cyg-OB2 association in the middle is clearly visible (see also Knödlseder 2000). A number of embedded clusters inside Cygnus X North could be the seeds for a newly formed OB association.
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