Integrated velocity contours of the ¹³CO (upper three mosaics) and C¹⁸O (lower three mosaics) emission superimposed on the GLIMPSE 8.0 μm grayscale. The contours are at multiples of the 9% and 12% level of each of the ¹³CO and C¹⁸O emission peaks, respectively. The peaks of upper three mosaics from left to right are 123.136, 59.055, and 93.380 K km s^-1; the peaks of the lower three mosaics from left to right are 25.598, 18.456, and 20.458 K km s^-1, respectively. The integrated velocity range is indicated in each panel. The green symbols “▴”, “■” and “★” indicate the positions of the water maser, the methanol maser, and IRAS 16158-5055, respectively.