user: Question: What is the density for the area that is larger than 4015.6 and a population smaller than 6178?
Columns: ['Commune', 'Area (km 2 )', '2002 population', 'Density (km 2 )', 'Government website']
Types: ['text', 'real', 'real', 'real', 'text']
Sample row: ['Pozo Almonte (Capital)', 13765.8, 10830.0, 0.8, 'link']
SQL:

assistant: SELECT "Density (km 2 )" FROM "Table" WHERE "Area (km 2 )" > 4015.6 AND "2002 population" < 6178.0;