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:
| Block | Director | Writers | Producer | Code |
| --- | --- | --- | --- | --- |
| 1.0 | Euros Lyn | Russell T Davies | Phil Collinson | 3X |
| 2.0 | Charles Palmer | Russell T Davies Gareth Roberts | Phil Collinson | 3.1 3.2 |
| 3.0 | Richard Clark | Russell T Davies Stephen Greenhorn | Phil Collinson | 3.3 3.6 |
| 4.0 | James Strong | Helen Raynor | Phil Collinson | 3.4 3.5 |
| 5.0 | Hettie MacDonald | Steven Moffat | Phil Collinson | 3.10 |
| 6.0 | Charles Palmer | Paul Cornell | Susie Liggat | 3.8 3.9 |
| 7.0 | Graeme Harper | Chris Chibnall Russell T Davies | Phil Collinson | 3.7 3.11 |
| 8.0 | Colin Teague | Russell T Davies | Phil Collinson | 3.12 3.13 |
Question:
What is the lowest block for director Graeme Harper?
Answer:
7.0