Fig. F.1
Bipolar nebula G342.07+00.42. Panel a: composite colour image as seen by Spitzer, and identification of the S18, S19, and S20 bubbles. Red, green, and blue are for the 24 μm, 8.0 μm, and 4.5 μm emissions, respectively (note that the 24 μm image is saturated in the central region). Panel b: red channel now shows the column density of molecular hydrogen.
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