user: Question: What is  the diameter in km of the feature with a longitude of 40.2E? 
Columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Year named', 'Name origin']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Aitchison Patera', '16.7S', '349.4E', '28.0', 1994.0, 'Alison; American geographer.']
SQL:

assistant: SELECT "Diameter (km)" FROM "Table" WHERE "Longitude" = '40.2E';