If the current H(B,E,I) of a body part reaches a certain negative value, it might be amputated. The amputation-row of the damage table states these values. The *x value is multiplied with the according H(B,E,I) of a body part hit. If a body part is equal or below in H(B,E,I), this body-part and and a roll Amputation attribute, it will be amputated. See also 14.1.3.