CREATE TABLE table_26319 ("No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" FLOAT, "U.S. viewers  ( millions ) " CLOB)

What the production code for the episode with 16.10 U.S. viewers?
SELECT MAX("Production code") FROM table_26319 WHERE "U.S. viewers (millions)" = '16.10'
SELECT MAX("Production code") FROM "table_26319" WHERE "U.S. viewers (millions)" = '16.10'