CREATE TABLE table_74723 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the size of the largest crowd that Essendon played in front of as the away team?
SELECT MAX("Crowd") FROM table_74723 WHERE "Away team" = 'essendon'
SELECT MAX("Crowd") FROM "table_74723" WHERE "Away team" = 'essendon'