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 | Title | Directed by | Written by | Code |
| --- | --- | --- | --- | --- |
| 1.0 | "Rose" "Aliens of London" "World War Three" | Keith Boak | Russell T Davies | 1.1 1.4 1.5 |
| 2.0 | "The End of the World" "The Unquiet Dead" | Euros Lyn | Russell T Davies Mark Gatiss | 1.2 1.3 |
| 3.0 | "Dalek" "Father's Day" | Joe Ahearne | Robert Shearman Paul Cornell | 1.6 1.8 |
| 4.0 | "The Long Game" | Brian Grant | Russell T Davies | 1.7 |
| 5.0 | "The Empty Child" "The Doctor Dances" | James Hawes | Steven Moffat | 1.9 1.10 |
| 6.0 | "Boom Town" "Bad Wolf" "The Parting of the Ways" | Joe Ahearne | Russell T Davies | 1.11 1.12 1.13 |
Question:
Which Written by has a Code of 1.2 1.3?
Answer:
Russell T Davies Mark Gatiss