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:
| Tie no | Home team | Score 1 | Away team | Attendance |
| --- | --- | --- | --- | --- |
| 1.0 | Sunderland | 1 – 2 | Blackburn Rovers | 18555.0 |
| 2.0 | Arsenal | 3 – 0 | Wigan Athletic | 59665.0 |
| 3.0 | Chelsea | 1 – 1 | Burnley | 41369.0 |
| 4.0 | Swansea City | 0 – 1 | Watford | 9549.0 |
| 5.0 | Manchester United | 1 – 0 | Queens Park Rangers | 62539.0 |
| 6.0 | Stoke City | 2 – 0 | Rotherham United | 15458.0 |
| 7.0 | Derby County | 2 – 1 | Leeds United | 18540.0 |
Question:
In what tie were Leeds United the away team?
Answer:
7.0