-2.0 or worse will be attacked in 1.0 systems
-2.5 or worse will be attacked in 0.9 systems
-3.0 or worse will be attacked in 0.8 systems
-3.5 or worse will be attacked in 0.7 systems
-4.0 or worse will be attacked in 0.6 systems
-4.5 or worse will be attacked in 0.5 systems

You need protection:
Gurista/EOM/Mordus: Kinetic/Thermal
Angel: Explosive/Kinetic/EM(Minor)/Thermal(Minor)
Sansha/Blood Raider: EM/Thermal
Serpentis: Kinetic/Thermal
Mercanary: Kinetic/Thermal/EM/Explosive

Damage to deal:
Angel/Thukker Tribe: Explosive
Blood Raiders/Sansha: EM/Thermal
EoM/Guristas: Kinetic
Mercenary: Thermal
The Syndicate/Mordu's Legion/Serpentis: Thermal/Kinetic

Mod efficiency:
1st Mod = 100%
2nd Mod = 86.9119842%
3rd Mod = 57.1037996%
4th Mod = 28.2469117%