Consider a character with power 4 and forte 2 (perhaps due to permanent injury reducing forte).
Mortal wound is 9, superficial is 2, and the interval between wound levels is 1. But this is not possible! For example, we might want to place light wound at 3, midi at 4, severe at 5 and traumatic at 6. The difference between 6 and 9 is three.
How does one calculate the PTGS in such a situation?
MW is 6 + average of power and forte, superficial is half of forte rounded down + 1.
Rules text under the heading Light, Midi, Severe and Traumatic
Place the other wound tolerances in order left to right between superficial and mortal. They may be set apart by up to half the Forte exponent (rounded up). Typically, the only gaps are between superficial and light, and light and midi. Severe, traumatic and mortal all tend to fall together.