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:
| Heat | Lane | Name | Country | Mark |
| --- | --- | --- | --- | --- |
| 1.0 | 6.0 | Sean Wroe | Australia | 47.23 PB |
| 1.0 | 5.0 | Richard Buck | United Kingdom | 47.54 |
| 1.0 | 4.0 | Greg Nixon | United States | 47.64 |
| 1.0 | 2.0 | Mark Ujakpor | Spain | 47.94 |
| 1.0 | 3.0 | Yoann Décimus | France | DNS |
| 2.0 | 4.0 | Nery Brenes | Costa Rica | 46.45 NR |
| 2.0 | 6.0 | Chris Lloyd | Dominica | 46.79 |
| 2.0 | 3.0 | Denis Alekseyev | Russia | 47.07 |
| 2.0 | 5.0 | Steven Green | United Kingdom | 47.44 |
| 2.0 | 2.0 | Arismendy Peguero | Dominican Republic | 47.45 |
| 3.0 | 6.0 | Tyler Christopher | Canada | 47.06 |
| 3.0 | 2.0 | California Molefe | Botswana | 47.22 |
| 3.0 | 5.0 | Michael Mathieu | Bahamas | 47.34 |
| 3.0 | 3.0 | Clemens Zeller | Austria | 47.34 |
| 3.0 | 4.0 | Nelton Ndebele | Zimbabwe | DNS |
| 4.0 | 5.0 | Maksim Dyldin | Russia | 46.96 |
| 4.0 | 6.0 | David Neville | United States | 47.43 |
| 4.0 | 3.0 | Edino Steele | Jamaica | 47.51 |
| 4.0 | 4.0 | Andrés Silva | Uruguay | 47.54 SB |
| 4.0 | 1.0 | Carlos Santa | Dominican Republic | 48.10 |
| 4.0 | 2.0 | Dalibor Spasovski | Macedonia | DNF |
| 5.0 | 5.0 | Johan Wissman | Sweden | 46.12 PB |
| 5.0 | 6.0 | Chris Brown | Bahamas | 46.47 |
| 5.0 | 4.0 | DeWayne Barrett | Jamaica | 47.02 |
| 5.0 | 1.0 | Mamoudou Hanne | Mali | 48.44 |
| 5.0 | 3.0 | Alleyne Francique | Grenada | 48.64 |
| 5.0 | 2.0 | Takeshi Fujiwara | El Salvador | 48.82 NR |
Question:
With a Mark of 46.47, What is the lowest Heat?
Answer:
5.0