No col or colgroup:
| Data | Data | Data | 
| Data | Data | Data | 
| Data | Data | Data | 
col elements with align=center on second col:
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| Data | Data | Data | 
| Data | Data | Data | 
colgroup and col elements, with align on colgroup so 2nd and 3rd columns centered:
| Data | Data | Data | 
| Data | Data | Data | 
| Data | Data | Data | 
colgroup and col elements, with align on col so 2nd column centered:
| Data | Data | Data | 
| Data | Data | Data | 
| Data | Data | Data |