The term GAP stands for General, Audience, Profile. This shows the percentage of people in a certain category that watch movies at the cinema.
´Our perfect audience member` we are aiming our film at is 40 and upwards which means we are covering about 50% which is half of the the population . Which means that if we actually started our movie it could become quiet popular since 50% matches our ideal audience member. This backs up our decision on our ideal audience member.