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:
| Date | Visiting Team | Final Score | Host Team | Stadium |
| --- | --- | --- | --- | --- |
| September 10 | Tennessee Titans | 10–13 ( OT ) | Pittsburgh Steelers | Heinz Field |
| September 13 | Chicago Bears | 15–21 | Green Bay Packers | Lambeau Field |
| September 20 | New York Giants | 33–31 | Dallas Cowboys | Cowboys Stadium |
| September 27 | Indianapolis Colts | 31–10 | Arizona Cardinals | University of Phoenix Stadium |
| October 4 | San Diego Chargers | 28–38 | Pittsburgh Steelers | Heinz Field |
| October 11 | Indianapolis Colts | 31–9 | Tennessee Titans | LP Field |
| October 18 | Chicago Bears | 14–21 | Atlanta Falcons | Georgia Dome |
| October 25 | Arizona Cardinals | 24–17 | New York Giants | Giants Stadium |
| November 8 | Dallas Cowboys | 20–16 | Philadelphia Eagles | Lincoln Financial Field |
| November 15 | New England Patriots | 34–35 | Indianapolis Colts | Lucas Oil Stadium |
| November 22 | Philadelphia Eagles | 24–20 | Chicago Bears | Soldier Field |
| November 29 | Pittsburgh Steelers | 17–20 ( OT ) | Baltimore Ravens | M&T Bank Stadium |
| December 6* | Minnesota Vikings | 17–30 | Arizona Cardinals | University of Phoenix Stadium |
| December 13 | Philadelphia Eagles | 45–38 | New York Giants | Giants Stadium |
| December 20 | Minnesota Vikings | 7–26 | Carolina Panthers | Bank of America Stadium |
| December 27 | Dallas Cowboys | 17–0 | Washington Redskins | FedExField |
| January 3 | Cincinnati Bengals | 0–37 | New York Jets | Giants Stadium |
| January 9 | New York Jets | 24–14 | Cincinnati Bengals | Paul Brown Stadium |
| January 9 | Philadelphia Eagles | 14–34 | Dallas Cowboys | Cowboys Stadium |
Question:
Tell me the visiting team for october 4
Answer:
San Diego Chargers