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Table 1.
Classification system of bar SF classes adopted in this work.
| SF class | Distribution of star formation |
| A | SF only in the bar central region. |
| B | SF at the ends of the bar, but not along the bar; |
| Ba | with circumnuclear SF, |
| Bb | without circumnuclear SF. |
| C | SF along the bar; |
| Ca | with circumnuclear SF, |
| Cb | without circumnuclear SF. |
| N | No flux detection. |
| U | Uncertain classification. |
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