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 | Writer | Director | Original air date | Viewing figure |
| --- | --- | --- | --- | --- | --- |
| 1.0 | "Episode 1" | Bill Gallagher | Charles Palmer | 13January2008 | 7.27 million |
| 2.0 | "Episode 2" | Bill Gallagher | Charles Palmer | 20January2008 | 7.01 million |
| 3.0 | "Episode 3" | Bill Gallagher | Charles Palmer | 27January2008 | 6.66 million |
| 4.0 | "Episode 4" | Paul Rutman | John Greening | 3February2008 | 6.72 million |
| 5.0 | "Episode 5" | Bill Gallagher | Charles Palmer | 10February2008 | 6.85 million |
| 6.0 | "Episode 6" | Bill Gallagher | John Greening | 17February2008 | 6.68 million |
| 7.0 | "Episode 7" | Carolyn Bonnyman | Marc Jobst | 24February2008 | 6.70 million |
| 8.0 | "Episode 8" | Gaby Chiappe | Marc Jobst | 2March2008 | 6.48 million |
| 9.0 | "Episode 9" | Bill Gallagher | John Greening | 9March2008 | 6.21 million |
Question:
What are all episodes with a viewing figure of 6.72 million?
Answer:
"Episode 4"