Table 3.
Mean values and Kendall’s τ rank correlation coefficient (p-value given in parenthesis).
| Kendall’s τ rank correlation coefficient |
||||
|---|---|---|---|---|
| Line Ratio | ⟨R⟩ | ⟨R⟩equal | Radius | ΣSFR |
| (1) | (2) | |||
| R21 |
 |
 |
0.36 (0.3) | 0.92 (4 × 10−4) |
| R13/12 |
 |
 |
−0.90 (0.003) | 0.73 (0.06) |
Notes. Measured for the line ratios of stacked spectra as function of galactocentric radius and SFR surface density (see Fig. 5). The value in parentheses indicates Kendall’s τp-value. We consider any correlation with p ≤ 0.05 significant. (1) ⟨R⟩ indicates the average line ratio weighted by 12CO(2–1) integrated intensity. The uncertainty for each line ratio is given by the weighted 16th and 84th percentile range. (2) The 12CO(1–0) median line ratio and 16th and 84th percentiles (since all pixels have the same size, this corresponds to weighing all points equally).
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