Velocity-integrated intensity maps of the ¹³CO (J =2−1) emission. Bottom panel: Velocity-integrated intensity map of G323.18a (blue contours integrated from −69.0 to −65.5 km s⁻¹ starting at 2 K km s⁻¹ with an increment of 5.5 K km s⁻¹), G323.18b (white contours, integrated from −65.5 to 64.0kms⁻¹ starting a 2 K km s⁻¹ with an increment of 3.8 Kkm s⁻¹), and G323.18c (red contours, integrated from −64 to −62 km s⁻¹ starting at 2 K km s⁻¹ with an increment of 2.3 K kms⁻¹). The black circle denotes H_II region G323.187+00.129 identified by Anderson et al. (2014). The yellow and red diamonds are prestellar and protostellar clumps from the Herschel Hi-Gal clump catalog, and the white crosses are ATLASGAL 870 µm clumps. The background is a three-color map with red, green, and blue for 24, 8, and 4.5 µm, respectively. Top panel: white contours start from 2 × 10²¹ cm⁻² and increase in steps of 1.9 × 10²¹ cm⁻². They display the distribution of the H₂ column density of the dotted rectangle in the bottom panel. The background is the same as in the bottom panel.