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:
| Week | Date | Visiting Team | Final Score | Host Team |
| --- | --- | --- | --- | --- |
| 2.0 | September 13 | Chicago Bears | 10–23 | Green Bay Packers |
| 3.0 | September 20 | New York Giants | 36–7 | Carolina Panthers |
| 4.0 | September 27 | Cleveland Browns | 16–23 | Baltimore Ravens |
| 5.0 | October 4 | Arizona Cardinals | 3–17 | St. Louis Rams |
| 6.0 | October 11 | Pittsburgh Steelers | 23–26 | Tennessee Titans |
| 7.0 | October 18 | Seattle Seahawks | 6–13 | San Francisco 49ers |
| 8.0 | October 25 | Tampa Bay Buccaneers | 36–17 | Minnesota Vikings |
| 9.0 | November 1 | Kansas City Chiefs | 13–31 | San Diego Chargers |
| 10.0 | November 8 | Indianapolis Colts | 27–10 | Jacksonville Jaguars |
| 11.0 | November 15 | Miami Dolphins | 14–19 | Buffalo Bills |
| 13.0 | November 29 | New Orleans Saints | 13–23 | Atlanta Falcons |
| 14.0 | December 6 | Denver Broncos | 26–13 | Oakland Raiders |
| 15.0 | December 13 | Cincinnati Bengals | 34–13 | Philadelphia Eagles |
Question:
Which week did the Baltimore Ravens play at home ?
Answer:
4.0