Maps of the ¹³CO J = 1−0 emission integrated every 5 K km s⁻¹. The contours are the TeV emission, and the blue crosses indicate the centroid of the three molecular clouds identified in the GRS at ~60 km s⁻¹. The rms noise of each panel is K km s⁻¹, where σ_rms and ∆υ are the mean rms noise per channel and the velocity resolution of the GRS, respectively, and N_chan = 24 is the number of integrated channels. The color scale is expressed in K km s⁻¹. Equatorial (J2000) coordinates are indicated in panel d.