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 | Attendance |
| --- | --- | --- | --- | --- |
| 21 | Morecambe | 2 – 1 | Grimsby Town | 1,713 |
| 22 | Huddersfield Town | 3 – 4 | Port Vale | 6,942 |
| 23 | Alfreton Town | 4 – 2 | Bury Town | 1,060 |
| 24 | Kidderminster Harriers | 1 – 0 | Cambridge United | 1,717 |
| 25 | Leicester City | 3 – 0 | Stevenage Borough | 7,586 |
| 26 | Milton Keynes Dons | 1 – 2 | Bradford City | 5,542 |
| 27 | Darlington | 0 – 0 | Droylsden | 2,479 |
| replay | Droylsden | 1 – 0 | Darlington | 1,672 |
| 28 | Chesterfield | 3 – 1 | Mansfield Town | 6,612 |
| 29 | AFC Telford United | 2 – 2 | Southend United | 3,631 |
| replay | Southend United | 2 – 0 | AFC Telford United | 4,415 |
| 30 | Curzon Ashton | 3 – 2 | Exeter City | 1,259 |
| 31 | Histon | 1 – 0 | Swindon Town | 1,541 |
| 32 | Kettering Town | 1 – 1 | Lincoln City | 3,314 |
| replay | Lincoln City | 1 – 2 | Kettering Town | 3,953 |
| 33 | Barnet | 1 – 1 | Rochdale | 1,782 |
| replay | Rochdale | 3 – 2† | Barnet | 2,339 |
| 34 | Hereford United | 0 – 0 | Dagenham & Redbridge | 1,825 |
| replay | Dagenham & Redbridge | 2 – 1 | Hereford United | 1,409 |
| 35 | Cheltenham Town | 2 – 2 | Oldham Athletic | 2,585 |
| replay | Oldham Athletic | 0 – 1 | Cheltenham Town | 2,552 |
| 36 | Luton Town | 0 – 0 | Altrincham | 3,200 |
| replay | Altrincham | 0 – 0 | Luton Town | 2,397 |
| Luton Town won 4–2 on penalties | Luton Town won 4–2 on penalties | Luton Town won 4–2 on penalties | Luton Town won 4–2 on penalties | Luton Town won 4–2 on penalties |
| 37 | Crewe Alexandra | 1 – 0 | Ebbsfleet United | 2,593 |
| 38 | Eastwood Town | 2 – 1 | Brackley Town | 960 |
| 39 | Leeds United | 1 – 1 | Northampton Town | 9,531 |
| replay | Northampton Town | 2 – 5 | Leeds United | 3,960 |
| 40 | Harlow Town | 0 – 2 | Macclesfield Town | 2,149 |
Question:
Who was the away team that played Northampton Town at home with a tie number of replay?
Answer:
Leeds United