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:
| Name | Latitude | Longitude | Diameter (km) | Year named |
| --- | --- | --- | --- | --- |
| Akkruva Colles | 46.1N | 115.5E | 1059.0 | 1985.0 |
| Asherat Colles | 12.0N | 162.0E | 500.0 | 2003.0 |
| Chernava Colles | 10.5S | 335.5E | 1000.0 | 1997.0 |
| Jurate Colles | 56.8N | 153.5E | 418.0 | 1985.0 |
| Marake Colles | 55.7N | 217.8E | 150.0 | 1997.0 |
| Mena Colles | 52.5S | 160.0E | 850.0 | 1994.0 |
| Migazesh Colles | 49.0S | 198.0E | 230.0 | 2000.0 |
| Molpe Colles | 76.0N | 192.0E | 548.0 | 1991.0 |
| Nahete Colles | 38.0N | 241.0E | 400.0 | 1997.0 |
| Nuliayoq Colles | 48.0N | 224.0E | 350.0 | 1997.0 |
| Olosa Colles | 18.0N | 353.3E | 200.0 | 1997.0 |
| Ran Colles | 1.0N | 163.0E | 400.0 | 2003.0 |
| Ruad Colles | 68.0S | 118.0E | 400.0 | 1997.0 |
| Salofa Colles | 63.0S | 167.0E | 250.0 | 1997.0 |
| T'ien Hu Colles | 30.7N | 15.1E | 947.0 | 1991.0 |
| Urutonga Colles | 10.0N | 154.0E | 500.0 | 2003.0 |
Question:
What is the diameter in km of t'ien hu colles?
Answer:
947.0