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 | Away team | Date |
| --- | --- | --- | --- | --- |
| 1 | Southampton | 1–1 | Arsenal | 19 March 1979 |
| Replay | Arsenal | 2–0 | Southampton | 21 March 1979 |
| 2 | Wolverhampton Wanderers | 1–1 | Shrewsbury Town | 10 March 1979 |
| Replay | Shrewsbury Town | 1–3 | Wolverhampton Wanderers | 13 March 1979 |
| 3 | Ipswich Town | 0–1 | Liverpool | 10 March 1979 |
| 4 | Tottenham Hotspur | 1–1 | Manchester United | 10 March 1979 |
| Replay | Manchester United | 2–0 | Tottenham Hotspur | 14 March 1979 |
Question:
Which tie number had an away team of Arsenal?
Answer:
1.0