X2 Shields are modestly more powerful than X1, but have a self-repair capacity.
Each damaged shield can repair a number of points per turn for free, exclusive
of CDR repair. A shield cannot be repaired if undamaged, nor can it repair above
it's normal maximum. Amount of repair is based on size class:
* SC 4: 3 points per shield per turn
* SC 3: 5 points per shield per turn
* SC 2: 8 points per shield per turn* (This assumes any SC 2 ships appear in X2)
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