Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What in Xenia's Diameter in km, with a latitude of 14 and a longitude of 249.4?

### Inputs:
table_name: table, columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Named after']

### Response:
SELECT COUNT Diameter (km) FROM table WHERE Latitude < 14 AND Name = xenia AND Longitude > 249.4