Reach is the number of people supporting a faction. It is calculated as the sum of system population multiplied by influence percentage for each system a faction is in. For example, a faction present in a system with 100,000 population at 70% influence, and a system with 30,000 population at 20% influence, would have a total reach of
(100,000 * 0.7) + (30,000 * 0.2) = 76,000. The (small) additional reach of Colonia Council due to systems on the highway is not included.