what is the name of the episode when the number of spectators was 5.60 millions?
CREATE TABLE "table1_23117208_3" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "prod_code" text,
  "viewers_millions" text
);
SELECT "title" FROM "table1_23117208_3" WHERE "viewers_millions"='5.60';