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Fig. 1

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Spitzer/IRAC 8 μm map (Hora et al. 2009) showing a part of Cygnus-X North. Black contours show integrated intensity map of the N2H+ (J = 1–0) line obtained with the FCRAO (Schneider et al. 2010). Red stars indicate the position of the sample of MDCs. Green triangles indicate the position of HII regions (Downes & Rinehart 1966).

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