Fig. 1
Spitzer 8 μm map of Orion Bar. Blue contours show H13CN J = 1 → 0 (Lis & Schilke 2003), which traces dense gas clumps, white contours are 12CO J = 1 → 0 (Tauber et al. 1994), which traces molecular gas, and black contours are [O I] 6300 Å (Weilbacher et al. 2015), which traces the ionization front. The red squares show the HF strip map perpendicular to the Orion Bar.
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