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:
| Season | Series Name | Champion | Races † | Pole Positions | Wins | Podiums | Fastest Laps | Points | Margin (pts) |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1978.0 | Shellsport F1 Series | Tony Trimmer | 8/12 | 4 | 5 | 8 | 5 | 149 | 56 |
| 1979.0 | Aurora F1 Series | Rupert Keegan | 13/15 | 5 | 6 | 6 | 4 | 65 | 2 |
| 1980.0 | Aurora F1 Series | Emilio de Villota | 12/12 | 6 | 5 | 9 | 4 | 85 | 33 |
| 1981.0 | no series | no series | no series | no series | no series | no series | no series | no series | no series |
| 1982.0 | British F1 Series | Jim Crawford | 4/5 | 3 | 3 | 3 | 4 | 34 | 18 |
Question:
What is the number of podiums for the races of 13/15?
Answer:
6.0