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(s) | Clubs from the previous round | Clubs involved | Fixtures |
| --- | --- | --- | --- | --- |
| First round | 3 September 2006 | none | 127.0 | 60.0 |
| Second round | 24 September 2006 | 60 winners from the first round | 122.0 | 56.0 |
| Third round | 11–12 November 2006 | 56 winners from the second round | 81.0 | 40.0 |
| Fourth round | 21 December 2006 6–7 January 2007 | 40 winners from third round | 57.0 | 28.0 |
| Fifth round | 21 January 2007 | 28 winners from fourth round | 27.0 | 13.0 |
| Sixth round | 10 February 2007 | 13 winners from fifth round | 15.0 | 7.0 |
| Quarter-finals | 28 February 2006 25 March 2007 | 7 winners from sixth round | 8.0 | 4.0 |
| Semi-finals | 18–19 April 2007 | 4 winners from the quarterfinals | 4.0 | 2.0 |
| Final | 27 May 2007 | 2 winners from the semifinals | 2.0 | 1.0 |
Question:
When 4 clubs are involved, what is the average number of fixtures?
Answer:
2.0