Three color image of the bubble connected to the long filament, MWP1G018980+00304, composed from the Spitzer 3.6 μm, 8 μm, and 24 μm bands in blue, green, and red, respectively. White contours are from ATLASGAL (at 0.3 Jy, 0.4 Jy, 0.5 Jy, 0.7 Jy, 0.9 Jy, 1.3 Jy, 1.8 Jy, and 2.5 Jy) for which the numbers denote the CLUMPFIND peaks, marked by the red circles. The yellow solid ellipse marks the bubble with interpolated bubble dimensions adopted from Simpson et al. (2012). The two arrows mark IRAS 18227-1227, and the massive proto-stellar object EGO G019.01-0.03. While the dashed orange boxes indicate the areas that have been mapped in H¹³CO⁺ with the IRAM 30 m telescope, the gray dashed ellipse is drawn around the ATLASGAL contours connected to G18.93.