What was the difference in the Cost-reimbursement and fixed-price-incentive-fee between Civil and Health?
{"Year Ended January 3, 2020 -- ": {"Defense Solutions": "Defense Solutions", "Civil": "Civil", "Health": "Health", "Total": "Total"}, "(in millions) -- Cost-reimbursement and fixed-price-incentive-fee": {"Defense Solutions": 3697, "Civil": 1997, "Health": 234, "Total": 5928}, "(in millions) -- Firm-fixed-price": {"Defense Solutions": 1203, "Civil": 1075, "Health": 1296, "Total": 3574}, "(in millions) -- Time-and-materials and fixed-price-level-of-effort": {"Defense Solutions": 466, "Civil": 564, "Health": 444, "Total": 1474}, "(in millions) -- Total": {"Defense Solutions": 5366, "Civil": 3636, "Health": 1974, "Total": 10976}}
cost_reimbursement_civil = df["(in millions) -- Cost-reimbursement and fixed-price-incentive-fee"]["Civil"]
cost_reimbursement_health = df["(in millions) -- Cost-reimbursement and fixed-price-incentive-fee"]["Health"]
answer = cost_reimbursement_civil - cost_reimbursement_health