How are waves scored?

A panel of five judges scores each wave on a scale of one to ten. For every scoring ride, the highest and lowest scores (of the five judges) are discounted and the surfer receives the average of the remaining three scores. There is no limit on the number of waves that will be scored, but the two best scoring waves (each out of a possible 10) are added together to become a surfer's heat total (out of a possible 20).