How many rushing yards where there when the opponent was Indiana and there was 503 passing yards?
CREATE TABLE "2013_season" (
  "rank" real,
  "player" text,
  "year" real,
  "opponent" text,
  "passing_yards" real,
  "rushing_yards" real,
  "total_offense" real
);
SELECT "rushing_yards" FROM "2013_season" WHERE "opponent"='Indiana' AND "passing_yards"=503;