Column density map of the interface between the Eagle Nebula and the H ii region around NGC 6611 (resolution of 25′′). The DisPerSe skeleton is drawn in white. The intensity contrast level is 4 × 10²¹ cm^-2 and the low-density threshold is 5 × 10²¹ cm^-2 (see Sousbie 2011), same values used for the Rosette map. The parts used for the profiles in Fig. 8 are indicated with the green dashed lines. The position of the main ionizing sources (O4 and 05 stars) are indicated with the white crosses (Oliveira 2008).