¹²CO map of the vicinity of HESS J1731−347 integrated from LSR velocity  − 13 km s^-1 to  − 25 km s^-1 (top) and from  − 75 km s^-1 to  − 87 km s^-1 (bottom) respectively corresponding to the intervals of the second and third ¹²CO peak shown in Fig. 8. The HESS significance contours from Fig. 5 together with the Galactic plane and the Fermi 95% position confidence level contours presented in the 1 year catalog are overlaid. The linear scale is in units of K km s^-1.