user: Question: What in xenia's Diameter in km, with a latitude of 14 and a longitude of 249.4?
Columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Named after']
Types: ['text', 'real', 'real', 'real', 'text']
Sample row: ['Xantippe', 10.9, 11.8, 40.4, 'Xanthippe , the wife of Socrates .']
SQL:

assistant: SELECT "Diameter (km)" FROM "Table" WHERE "Latitude" < 14.0 AND "Name" = 'xenia' AND "Longitude" > 249.4;