Comparison of GLIMPSE 3603.6 μm (orange) and 4.5 μm (red) Spitzer-IRAC image (top left), the normalized column density map (top right), the column density map (bottom left) and the COHRS ¹²CO (3–2) velocity-integrated image (bottom right) in a region of the Gp centred at (l, b) =10.50°, −0.18°. Weote the presence of the infrared dark cloud G11.11–0.12, the Galactic ‘Snake’, identified by the red arrow. The original column density is displayed logarithmic scale and spans the range 1 × 10²¹ to 1 × 10²³ cm⁻². The COHRS image is represented in a linear scale with intensity that spans the range of 0–100 K km/s.