#+CAPTION: table with separator before and after header
|---+---+---|
| a | b | c |
|---+---+---|
| 1 | 2 | 3 |

#+CAPTION: table with separator after header
| a | b | c |
|---+---+---|
| 1 | 2 | 3 |

#+CAPTION: table without header (but separator before)
|---+---+---|
| 1 | 2 | 3 |

#+CAPTION: table without header
| 1 | 2 | 3 |