westvleteren 18 18.7 18.9 18 17 16 16 15 14.3 14.9 18 18.6 20.3 25.4 25.9 25 23 25.7 25.4 28 29.9 29 30 30.1 31 31 29.5 25.9 24 23 22.3 21.6 24 23.9 27.2 29.1 26 25 24.5 22.1 23.4 25.7 25 23 22.7 18 18