Top: integrated ¹²CO(1−0) emission in natural a) and robust b) weighting for the SSC data. The zeroth moment maps have been primary beam corrected. The ¹²CO(1−0) emission has been integrated from –220 km s^-1 to 250 km s^-1. Contours run from 5σ in steps of 10σ. The rms value is: a) 1σ = 0.025 Jy beam^-1 km s^-1 and b) 1σ = 0.022 Jy beam^-1 km s^-1. Bottom: integrated ¹²CO(2−1) emission in natural c) and robust d) weighting for the SSC data. The ¹²CO(2−1) emission has been integrated from –200 km s^-1 to 200 km s^-1. Contours run from c) 5σ in steps of 20σ, d) 3σ in steps of 10σ. The rms value is: 1σ = 0.039 Jy beam^-1 km s^-1 for both maps. The red cross indicates the position of the dynamical center in all panels (Table 3). The beam sizes are shown in the lower left corners and correspond to the values listed in Table 2.