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:
| Pos. | Name | Place of Birth | Date of Birth | Previous Club | Date Joined | Fee |
| --- | --- | --- | --- | --- | --- | --- |
| GK | Alan Buck | Colchester | 25 August 1946 | Youth Team | 1 August 1964 | Free |
| GK | Sandy Kennon | Johannesburg | 28 November 1933 | Norwich City | 6 March 1965 | Free |
| DF | Duncan Forbes | Edinburgh | 19 June 1941 | Musselburgh Athletic | 14 April 1962 | Free |
| DF | John Fowler | Leith | 17 October 1933 | Bonnyrigg Rose Athletic | 20 August 1955 | Free |
| DF | Brian Hall | Burbage | 9 March 1939 | Mansfield Town | 6 March 1965 | Free |
| DF | Mick Loughton | Colchester | 8 December 1942 | Youth Team | 1 August 1964 | Free |
| DF | Ray Price | Hetton-le-Hole | 18 May 1944 | Norwich City | 6 February 1965 | Free |
| DF | David Raine | Darlington | 28 March 1937 | Doncaster Rovers | 24 September 1965 | Free |
| MF | Barrie Aitchison | Colchester | 15 November 1937 | Tottenham Hotspur | 22 August 1964 | £750 |
| MF | Bobby Blackwood | Edinburgh | 20 August 1934 | Ipswich Town | 1 September 1965 | Free |
| MF | Arthur Kaye | Higham | 9 May 1933 | Middlesbrough | 21 August 1965 | Free |
| MF | John Mansfield | Colchester | 13 September 1946 | Youth Team | 1 August 1964 | Free |
| MF | Derek Trevis | Birmingham | 9 September 1942 | Aston Villa | 7 March 1964 | Free |
| FW | Peter Bullock | Stoke-on-Trent | 17 November 1941 | Southend United | 30 October 1965 | Free |
| FW | Reg Stratton | Kingsley | 10 July 1939 | Fulham | 21 August 1965 | Free |
Question:
how many players are listed as df?
Answer:
6