Top  −  HST/ACS color-composite image of the N 11B region (blue: F814; green: F658N/Hα; red: F660N/[N ii]). Images were downloaded from the Hubble Legacy Archive (http://hla.stsci.edu/) and later stitched with Montage (http://montage.ipac.caltech.edu/). The white stripes correspond to a gap between individual exposures. The yellow polygon indicates the field-of-view of the Herschel/PACS observations ( ≈ 2.3′ × 2.3′). The 4 rectangles in color indicate specific regions discussed in the text. The dashed circles represent the ISO-LWS observation (from 65^′′ to 80^′′FWHM beam) and the slit represents the optical observation by Tsamis et al. (2001). Bottom  −  Close-up of the eastern (left panel) and western (right panel) sides. The stellar complexes are labeled as the brightest star with a “+” sign appended.