Intensity ratio, I_¹²CO/I_¹³CO, (color) and ¹²CO(J = 3 →  2) flux (contours) for three different velocity channels (the full channel range is presented in Fig. C.1). The channels are averaged over three km s^-1  and the panels are are labeled according to their V_LSR. The ratio is presented where ¹³CO emission is detected at higher than three σ (where σ = 15  mJy beam^-1) and the color scale runs from 0 to 42. The ¹²CO contour levels are drawn at 6,12,24,48 and 96σ, with σ = 25 mJy beam^-1. Where no ¹³CO is detected, the contours are equivalent to a 1σ lower limit to the ¹²CO/¹³CO intensity ratio of 10,20,40,80, and 160, respectively. The beam size is indicated in the left panel.