Fig. 6
Schematic of the proposed origin of the belt around the waist of the 24 μm bipolar nebula associated with MWC 349A (not to scale): (1) the incident hemispherical shock wave (one of the two lobes of the nebula); (2) the ring-like Mach shock wave (the belt); (3) the tangential discontinuity; (4) the reflected shock wave. See text for details.
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