Table: akitu_sulcus_2
Columns: name
latitude
longitude
diameter
year_named

Question: What's the lowest diameter when the longitude is 71.1w?
SQL: SELECT MIN("diameter") FROM akitu_sulcus_2 WHERE "longitude" = '71.1w'

Question: What is dardanus sulcus' lowest diameter?
SQL: SELECT MIN("diameter") FROM akitu_sulcus_2 WHERE "name" = 'dardanus sulcus'