What was the visiting team that played a round 16 game?
CREATE TABLE "attendance" (
  "attendance" real,
  "round" text,
  "date" text,
  "home" text,
  "score" text,
  "away" text,
  "venue" text,
  "weekday" text,
  "time_of_day" text
);
SELECT "away" FROM "attendance" WHERE "round"='round 16';