Schema: CREATE TABLE table_name_32 (image_quality VARCHAR, date VARCHAR, multiple_sessions VARCHAR, authentication VARCHAR)
Question: what is the image quality when the multiple sessions is x, the authentication is ✓ and the date is may 15, 2007?
SQL: SELECT image_quality FROM table_name_32 WHERE multiple_sessions = "x" AND authentication = "✓" AND date = "may 15, 2007"