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:
| Round | Date | Opponent | Venue | Result | Attendance |
| --- | --- | --- | --- | --- | --- |
| R2 1st Leg | 14 September 1999 | Chesterfield | A | 0–0 | 4941.0 |
| R2 2nd Leg | 21 September 1999 | Chesterfield | H | 2–1 (won 2-1 on agg) | 25602.0 |
| R3 | 13 October 1999 | Watford | H | 1–0 | 8846.0 |
| R4 | 30 November 1999 | Arsenal | H | 2–2 (won 3-1 on pens) | 23157.0 |
| R5 | 14 December 1999 | Tranmere Rovers | A | 1–2 | 10581.0 |
Question:
Whose attendance was the highest when the team played Arsenal?
Answer:
23157.0