Integrated intensity maps at different velocity ranges (blue: −50 to −43 km s^-1; green: −43 to −35 km s^-1; red: −35 to −28 km s^-1). We adopted the combined-configuration dataset in natural weighting in order to show the additional weak emission features. The contour levels of each Doppler-shifted component for CS, HCN and SO are 15, 20, 30, 40,...%, 10, 20, 30,...% and 5, 10, 20, 30,...% of the emission peak, respectively. We note that the first contours are all ≥3σ noise level. The markers are identical to the ones in Fig. 1.