Table 5.
Spatial distribution comparison of the molecular species.
| s1 | s2 | s3 | NBE | SBE | NUC | |
|---|---|---|---|---|---|---|
| 12CO (1 − 0) | ✓ | ✓ | ✓ | ✓ | ✓ |  |
| 12CO (2 − 1) | ✓ | ✓ | ✓ | ✓ | ✓ |  |
| HCN (1 − 0) | ✓ | ✓ | ✓ | ✓ | ✓ |  |
| HCO+ (1 − 0) | ✓ | ✓ | ✓ | ✓ | ✓ |  |
| HNC (1 − 0) | ✓ | ✓ | ✓ | ✓ | ✓ |  |
| CS (2 − 1) | ✗ | ✗ | ✓ | ✓ | ✓ |  |
| CS (3 − 2) | ✗ | ✗ | ✗ | ✓ | ✓ |  |
| N2H+ (1 − 0) | ✗ | ✓ | ✓ | ✓ |  |
✓ |
| HC3N (10 − 9) | ✗ | ✗ | ✓ | ✓ |  |
✓ |
| HC3N (16 − 15) | ✗ | ✗ | ✗ | ✗ |  |
✓ |
| CH3OH (2k−1k) | ✗ | ✗ | ✓ | ✓ |  |
✓ |
| CH3OH (3k−2k) | ✗ | ✗ | ✗ | ✓ |  |
✓ |
| C2H (1 − 0), 3/2 − 1/2 | ✗ | ✗ | ✗ | ✓ | ✓ |  |
| H2CO (2 − 1) | ✗ | ✗ | ✗ | ✗ |  |
✓ |
Notes. The comparison is based on their S/N > 5 peaks in the integrated intensity maps (see Fig. A.2). We consider the three spiral structures (s1–s3), the inner bar ends (NBE and SBE) and the nuclear region (NUC). ✓ denotes that we find within this region a S/N > 5 detection, ✗ not; 
refers to the location of the peak/maximum in integrated intensity in the inner 50″ ≈ 1.9 kpc.
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