CREATE TABLE table_28980706_4 (rank__timeslot_ VARCHAR, share__18_49_ VARCHAR)

When 13 is the share (18-49) what is the rank (timeslot)?
SELECT rank__timeslot_ FROM table_28980706_4 WHERE share__18_49_ = 13
SELECT "rank__timeslot_" FROM "table_28980706_4" WHERE "share__18_49_" = 13