How many U.S. viewers (million) are there for the episode whose Production code is 3T7051?
CREATE TABLE "table1_13183076_3" (
  "no" real,
  "num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_million" text
);
SELECT "u_s_viewers_million" FROM "table1_13183076_3" WHERE "production_code"='3T7051';