Spectra of Hnα (n = 151–158; black), CHIMPS ¹³CO(3–2) (blue), GRS ¹³CO(1–0) (red; data extends only to −5 km s−1) and CHIMPS C¹⁸O(3–2) (green), at selected locations in W49A, as indicated in Figs. 2 and 4. The RRL emission is scaled by a factor of 1000, and given in Jy beam−1, while the antenna temperature (T_A) of the CO emission is given in K. The black dashed lines indicate the Gaussian fits to the RRL emission mentioned in Sect. 2.3. The vertical black dashed line denotes the systemic velocity (v_LSR = 8.6 km s−1; Quireza et al. 2006a). The channel spacing is 5 km s−1for the RRLs, 0.5 km s−1 for CO spectra from CHIMPS, and 0.21 km s−1 for GRS.