Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Fraction | Ellipsis | Vinculum | Dots | Parentheses |
| --- | --- | --- | --- | --- |
| 1/9 | 0.111… | 0. 1 | 0.\dot{1} | 0.(1) |
| 1/3 | 0.333… | 0. 3 | 0.\dot{3} | 0.(3) |
| 2/3 | 0.666… | 0. 6 | 0.\dot{6} | 0.(6) |
| 9/11 | 0.8181… | 0. 81 | 0.\dot{8}\dot{1} | 0.(81) |
| 7/12 | 0.58333… | 0.58 3 | 0.58\dot{3} | 0.58(3) |
| 1/81 | 0.012345679… | 0. 012345679 | 0.\dot{0}1234567\dot{9} | 0.(012345679) |
| 22/7 | 3.142857142857… | 3. 142857 | 3.\dot{1}4285\dot{7} | 3.(142857) |
Question:
How much is vinculum when the parentheses are 0.(81)?
Answer:
0. 81