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:
| Episode | Air date | Official ITV1 rating | Weekly rank | Share |
| --- | --- | --- | --- | --- |
| Auditions 1 | 16 August | 10.78 | 1 | 48.2% |
| Auditions 2 | 23 August | 10.1 | 1 | 45.4% |
| Auditions 3 | 30 August | 8.8 | 2 | 43.5% |
| Auditions 4 | 6 September | 9.57 | 1 | 42.8% |
| Auditions 5 | 13 September | 9.96 | 1 | 43.2% |
| Auditions 6 | 20 September | 10.01 | 1 | 41.7% |
| Bootcamp 1 | 27 September | 8.94 | 6 | 36.0% |
| Bootcamp 2 | 28 September | 9.47 | 1 | 38.1% |
| Judges' houses 1 | 4 October | 10.84 | 1 | 40.5% |
| Judges' houses 2 | 5 October | 10.11 | 3 | 42.7% |
| Live show 1 | 11 October | 11.09 | 1 | 44.1% |
| Results 1 | 11 October | 9.05 | 7 | 40.8% |
| Live show 2 | 18 October | 10.21 | 3 | 38.5% |
| Results 2 | 18 October | 9.13 | 9 | 39.7% |
| Live show 3 | 25 October | 10.37 | 2 | 39.7% |
| Results 3 | 25 October | 8.89 | 10 | 38.0% |
| Live show 4 | 1 November | 11.65 | 1 | 43.3% |
| Results 4 | 1 November | 9.72 | 6 | 37.6% |
| Live show 5 | 8 November | 10.72 | 2 | 42.6% |
| Results 5 | 8 November | 9.46 | 7 | 35.6% |
| Live show 6 | 15 November | 11.28 | 1 | 43.5% |
| Results 6 | 15 November | 10.62 | 2 | 42.9% |
| Live show 7 | 22 November | 11.77 | 1 | 43.2% |
| Results 7 | 22 November | 9.98 | 6 | 41.1% |
| Live show 8 | 29 November | 12.67 | 1 | 46.0% |
| Results 8 | 29 November | 11.41 | 2 | 50.0% |
| Semi-final | 6 December | 10.3 | 3 | 39.1% |
| Semi-final results | 6 December | 10.6 | 2 | 39.6% |
| Final performances | 13 December | 13.77 | 2 | 50.3% |
| Final results | 13 December | 14.06 | 1 | 54.4% |
| Series average | 2008 | 10.51 | N/A | 42.4% |
Question:
What is the Official ITV1 rating for auditions 4?
Answer:
9.57