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Fig. 1

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a) Composite Spitzer color image combining the IRAC 8.0 μm (blue) bands with MIPS 24 (green) and 70 μm (red). The FOV is  ~30′, N is up and E is left. The two black boxes outline the “pillars of creation”, which extend from the bottom to the center, pointing slightly to the W, and the “spire”, originating in the E and almost pointing straight toward the W. The black circle outlines the MIPS 24 μm shell. The black arrow indicates the position of Pilbratt’s blob. The position and spectral type of the most massive stars of NGC 6611 are overplotted: O stars are in red, B stars are in white. The MIPS 24 and 70 μm images are also shown separately in panels b) and c).

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