Bipolar nebula G319.88+00.79, composed of the S97 & S98 bubbles (Churchwell et al. 2006; the centres of the bubbles are indicated). a) Composite colour image based on Spitzer observations. Red, green, and blue are for the 24 μm, 8.0 μm, and 4.5 μm emissions, respectively. b) Composite colour image, with red, green, and blue for the 250 μm, 8.0 μm, and 4.5 μm emissions, respectively (logarithmic units). The cold parental filament (or sheet) appears in red, and the PDR surrounding the ionized lobes in green.