Weighted mean excitation temperature map for CHIMPS. For each pixel, the weighted mean excitation temperature, , has been calculated for the corresponding spectrum, with weightings given by the of ¹³CO (3–2), and excluding all voxels for which S∕N < 5. Compact H II regions from CORNISH (Kalcheva et al. 2018) are overlaid as green squares, and H II regions and MYSOs from the rms survey (Lumsden et al. 2013) are shown as yellow triangles and magenta circles, respectively.