A coverture fraction is the method used to determine that portion of the benefit which was earned during the marriage through date of separation, from that portion of the benefits which were earned outside of the period of marriage. The coverture fraction represents that portion of the value of the benefits attributable to the community property. The numerator of the fraction represents the total period of time the participant-spouse participated in the plan during the marriage through separation, and the denominator is the total period of time the participant-spouse participated in the plan as of the date the non-participant spouse’s benefit is calculated.