Selected positions of CO corresponding to the CH positions reported in Figure 4. The location of each subplot is indicative of pointings observed both in ¹²CO and ¹³CO. The filled contours are the same as in Figure 4. In each subplot, the thick black line is ¹²CO and the thin red line is ¹³CO multiplied by a factor of three for clarity. A frame with the same scale and range for each subplot is reported in the bottom left corner of the figure.