user: ### NOW ANSWER:
Question: Who wrote all the shows with 18.73 u.s. viewers?
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Featured character(s)', 'Original air date', 'U.S. viewers (million)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [3.0, '" Tabula Rasa "', 'Jack Bender', 'Damon Lindelof', 'Kate', 'October6,2004', '16.54']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "U.S. viewers (million)" = '18.73';