An overview of RCW 120. Top left: false color image of RCW 120 in Herschel fluxes at 70 μm (blue), 160 μm (green), and 250 μm (red). The H II bubble of RCW 120 stands out prominently. Top right: H I line integrated (v = −20 to 10 km s⁻¹) emission from the SGPS survey (McClure-Griffiths et al. 2005) with contours of Herschel dust column density overlaid (levels A_v = 15 to 50 in increments of five). The Herschel data were observed within the HiGAL program (Molinari et al. 2010) and the column density map was produced using the PPMAP method (Marsh et al. 2017). The position where we show an individual spectrum (Fig. 6) is indicated by a blue triangle and the off-position we used for the HISA analysis is marked with a gray triangle. The white and gray squares outline the spectra map displayed in Fig. D.1 and the star symbol indicates the exciting star of RCW 120. Bottom left and right: line integrated ¹²CO (1 →0) intensity maps of RCW 120 between − 37 to − 20 km s⁻¹ and − 20 to 10 km s⁻¹, respectively. The CO data were taken with the MOPRA telescope and have a resolution of 30″ (Torii et al. 2015).