What is the name of the writer when the ratings was 2.61 million?
CREATE TABLE "table1_23705843_1" (
  "episode" text,
  "director" text,
  "writer" text,
  "original_air_date" text,
  "ratings_millions" text
);
SELECT "writer" FROM "table1_23705843_1" WHERE "ratings_millions"='2.61';