| http://www.w3.org/ns/prov#value | - I will tentatively speculate that the confusion here is a result of how the eye perceives color, because there are very few zip codes in this map that are the deepest shade of blue (corresponding to 25% or above.) However, when an urban blueish area is surrounded by a sea of yellow, the eye perceives it as bluer than it is because of the contrast with the surrounding areas.
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