CREATE TABLE "round_8" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: When the away team scored 18.13 (121), what was the largest crowd size?
SQL: SELECT MAX("crowd") FROM "round_8" WHERE "away_team_score"='18.13 (121)';