Table 2: Results of the observations.
Position Offsets Line $T_{{\rm mb}}$ Velocity Width $I_{{\rm CO}}$ $M_{{\rm gas}}$ T21/T10
  [ $'' \times ''$]   [mK] [km s-1] [km s-1] [K km s-1] [10 $^8~M_\odot$]  
centre1 [0, 0] CO(1-0) $15.2 \pm 4.2$ - $70.2 \pm 22.8$ $333 \pm 69.1$ $5.4 \pm 0.8$ 12.6  
centre1 [0, 0] CO(2-1) $76 \pm 4.6$ - $25 \pm 4.8$ $301 \pm 11.5$ $24.3 \pm 0.8$    
centre1 [0, 0] CO(2-1) $26.7 \pm 1.6$ - $41.2 \pm 4.5$ $277.9 \pm 10.9$ $7.9 \pm 0.26$   1.7
centre2 [-11, 3] CO(1-0) $26.7 \pm 5.6$ - $74.8 \pm 16.4$ $238.6 \pm 41.3$ $6.8 \pm 0.9$ 15.8  
centre2 [-11, 3] CO(2-1) $83.7 \pm 17.2$ - $99.7 \pm 14.8$ $231.7 \pm 34.6$ $20.6 \pm 2.6$    
centre2 [-11, 3] CO(2-1) $31.1 \pm 1.2$ - $63.8 \pm 2.9$ $257.6 \pm 6.7$ $8.5 \pm 0.2$   1.2
centre3 [11, -3] CO(1-0) $10.3 \pm 5.1$ - $60.4 \pm 81.2$ $340.3 \pm 216.2$ $3.7 \pm 1.4$ 8.7  
centre3 [11, -3] CO(2-1) $29.7 \pm 10.2$ $9.4 \pm 29.1$ $340.2 \pm 69.2$ $10.7 \pm 1.9$    
centre3 [11, -3] CO(2-1) $16 \pm 1.3$ - $45.1 \pm 5.9$ $248.4 \pm 15.4$ $4.2 \pm 0.2$   1.6
centre4 [3, 11] CO(1-0) $26.4 \pm 8.4$ - $36.9 \pm 13.4$ $83.1 \pm 29.6$ $2.3 \pm 0.8$ 5.4  
centre4 [3, 11] CO(2-1) $18.7 \pm 12.2$ - $61.5 \pm 60.7$ $320.4 \pm 97.8$ $6.4 \pm 2.0$    
centre4 [3, 11] CO(2-1) $17 \pm 1.1$ - $44.7 \pm 4.9$ $271.2 \pm 12.1$ $4.9 \pm 0.2$   0.6
centre5 [-8, 14] CO(1-0) $22.9 \pm 7.6$ - $74.5 \pm 20.4$ $167.5 \pm 43.3$ $4.1 \pm 1.0$ 9.5  
centre5 [-8, 14] CO(2-1) $33.2 \pm 10.1$ - $76 \pm 21.6$ $246 \pm 50$ $8.7 \pm 1.5$    
centre5 [-8, 14] CO(2-1) $23.8 \pm 0.6$ - $61.3 \pm 1.7 $ $248.2 \pm 4.2$ $6.3 \pm 0.1$   1.0
centre6 [-21, 6] CO(1-0) $23.4 \pm 4.3$ - $87.4 \pm 11.5$ $191.3 \pm31.9$ $4.7 \pm 0.6$ 11.1  
centre6 [-21, 6] CO(2-1) - $14.8 \pm 12.2$ $165.9 \pm 68$ $247.3 \pm 162.8$ - $3.9 \pm 2.0$    
centre6 [-21, 6] CO(2-1) $24 \pm 1.1$ - $65.4 \pm 3.1$ $246.7 \pm 7.1$ $6.3 \pm 0.2 $   1
centre7 [-3, -11] CO(1-0) $10 \pm 8.2$ - $34.9 \pm 79.2$ $441.4 \pm 209.8$ $4.7 \pm 1.8$ 11  
centre7 [-3, -11] CO(2-1) $32.4 \pm 7.6 $ - $164.8 \pm 12.8 $ $117 \pm 39.8$ $4.0 \pm 1.0$    
centre7 [-3, -11] CO(2-1) $15.5 \pm 1.1$ - $32.7 \pm 5.6$ $277.4 \pm 13.8$ $4.5 \pm 0.2$   1.6
centre8 [-18, 17] CO(1-0) 14.1 $\pm$ 2.2 -82.9 $\pm$ 8.5 142.8 $\pm$ 16.2 2.1 $\pm$ 0.2 5  
centre8 [-18, 17] CO(2-1) - $28.2 \pm 6.2$ $121.1 \pm 14.5$ $47.6 \pm 28.2$ - $1.4 \pm 0.5$    
centre8 [-18, 17] CO(2-1) $21.1 \pm 1.1$ - $56.1 \pm 3.5$ $241.4 \pm 8.2$ $5.4 \pm 0.2$   1.5
centre9 [-24, -5] CO(1-0) $16.2 \pm 5.6$ - $149.5 \pm 16.3$ $114.3 \pm 36.4$ $2.0 \pm 0.6$ 4.6  
centre9 [-24, -5] CO(2-1) - $48.9 \pm 18.4$ $55.2 \pm 15.4 $ $63.7 \pm 33.1$ - $3.3 \pm 1.4$    
centre9 [-24, -5] CO(2-1) $12.4 \pm 1.0$ - $64.2 \pm 5.9$ $275.1 \pm 14.3$ $3.6 \pm 0.2$   0.8


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