user: Question: What's the lowest diameter when the longitude is 71.1W?
Columns: ['Name', 'Latitude', 'Longitude', 'Diameter', 'Year named']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Akitu Sulcus', '38.9N', '194.3W', 365.0, 1997.0]
SQL:

assistant: SELECT MIN("Diameter") FROM "Table" WHERE "Longitude" = '71.1W';