If you are thinking on this part of the table:
Imagine that yellow bar on your tank is full (Shaft is fully reloaded). Full energy bar contains 1000 Energy points on each modification.
After you completely clear out energy points (fire a shot in full sniping mode) on M1 modification in one second 121.18 energy points are restored. It increases with modification of turret. On M2 in one second 122.65 energy points are restored and so on, which is clear from this table. When energy bar is fully loaded, you can enter Sniping mode again (it takes exactly 8,252 seconds to fully reload M0 modification, and it decreases with better modifications.) Hope you understand now :)