Face-on/edge-on/face-on Orion Bar geometry as proposed by HJ95. Values are taken from: green: HJ95; red: Menten et al. (2007); blue: Pellegrini et al. (2009); and orange: van der Werf et al. (2013). For the inclination angle, α′, values between less than 3° and 15° have been discussed (Jansen et al. 1995; Melnick et al. 2012).
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