Fig. 1.
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Spitzer 8 μm image of the bubble at ∼2″ angular resolution from the GLIMPSE survey (Churchwell et al. 2006). The blue star is the O7.5–9.5V/III star and the small black stars are members of the associated IR clusters. The green circle is a by-eye approximation of the bright IR ring. The contour lines show [C II] emission from 50 to 250 K km s−1 in steps of 50 K km s−1.
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