-2.00 for access to 1.0 security level systems
-2.50 for access to 0.9 security level systems
-3.00 for access to 0.8 security level systems
-3.50 for access to 0.7 security level systems
-4.00 for access to 0.6 security level systems
-4.50 for access to 0.5 security level systems
-5.0 or less can be attacked by anyone without sentry gun intervention.