Spitzer/IRAC GLIMPSE three-color image (in red the 5.8 μm image, 8 μm in green and 3.6 μm in blue) of RCW 49 overlaid with ¹²CO(J = 2–1) contours at velocity ranges of 10.8 to 20.9 km s^-1 and 1.2 to 8.7 km s^-1 observed with the Nanten 2 telescope (in blue and purple respectively). The white contours show the HESS significance derived for a correlation radius of 0.1°, hard cuts and a maximum energy of 2.5 TeV. The lowest contour corresponds to 4 σ.