What is the production code for the episode that had 1.32 million U.S. viewers?
CREATE TABLE "table1_22347090_6" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_million" text
);
SELECT "production_code" FROM "table1_22347090_6" WHERE "u_s_viewers_million"='1.32';