(a) Velocity integrated intensity map of ¹³CO (J = 2–1) with the H₂ column density determined from spectral energy distribution fitting overlaid as contours in levels of (0.9, 1.1, 1.3, 1.5, 1.9, 2.4, 3.0, 4.0, and 5.0) × 10²² cm⁻². The velocity interval for integration is [−41.5, −33.0] km s⁻¹. The σ levels of the ¹³CO (J = 2–1) integrated map is σ = 0.08 K km s⁻¹. The main and branched skeletons are shown as white and black curves, respectively. Magenta ellipses mark the dust clumps. The filled magenta circle in the lower right corner indicates the beam size (HPBW) of the CO observation. (b) Same as panel (a), but for C¹⁸O (J = 2–1). (c) Same as panel (a), but for dust temperature. The filled magenta circle in the lower right corner indicates the beam size of the Herschel 500 μm wave band.