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Our current assumption is that the bleed area has the same population density as the broadcast area. This is particularly naïve when: - the bleed area overlaps the sea – no-one lives in the sea - the broadcast area is a village and the bleed area is the surrounding countryside - the broadcast area is adjacent to a densely populated area like a city We can be smarter about this now that we have a way of determining the number of phones in an arbitrary area, based on the known areas that we have population data about. Calculating the population in an overlap is a slightly more intensive calculation. So we only doing it for areas which are smaller enough that it doesn’t slow things down too much. For larger areas we still use the more naïve algorithm.