Colorado defines shared physical care as each parent keeping the children overnight for more than 92 overnights each year and both contributing to the children’s expenses. In shared care, the basic obligation is multiplied by 1.50 to account for duplicated household costs and then apportioned by income and overnights. Split physical care applies when each parent has primary care of at least one child. In split care, each parent’s theoretical obligation is calculated and then offset. Work-related child care and extraordinary medical expenses are added proportionally in both models. The governing definitions and formulas appear in the statute.