Composite images of the Orion Bar (top panel) and NGC 7023 (bottom panel). Red indicates the 8 μm emission observed with Spitzer. Green shows the vibrationally excited emission of H₂ from Lemaire et al. (1996) and van der Werf et al. (1996) for NGC 7023 and Orion Bar, respectively. Blue shows the ¹²CO emission, J = 6 − 5 for the Orion Bar (Lis & Schilke 2003) and J = 1−0 for NGC 7023 (Gerin et al. 1998). The circles represent the HPBW of Herschel at 550 GHz and 1900 GHz. The square indicates the position of the central spaxel of the PACS observations.