9×109NC−19\times 10^9NC^{-1}9×109NC−1
8.11×109NC−18.11\times 10^9NC^{-1}8.11×109NC−1
8.19×109NC−18.19\times 10^9NC^{-1}8.19×109NC−1
9.11×109NC−19.11\times 10^9NC^{-1}9.11×109NC−1