A Test Layer population Population in the United States A sample filter that filters the United States into three categories of population, drawn in different colors > 4M PERSONS 4000000 #4D4DFF 0.7 2M - 4M PERSONS 4000000 PERSONS 2000000 #FF4D4D 0.7 < 2M PERSONS 2000000 #4DFF4D 0.7