definiens: shall mean, with respect to a particular time period, the total cash amounts collected dur ing such time period by Cypress or any of its Affiliates or any Licensee for services or testing using the Lupus Monitoring Product, less deductions for refunds or rebates of previously collected amounts where applicable . In the event the Lupus Monitoring 5 Product is sold or used in a product, service or process that includes at least one additional marker that is not covered by the Lupus Monitoring Product ( a ), the Net Sales for such Combination Product shall be calculated by multiplying the actual Net Sales of such Combination Product by the fraction A/(A+B ), where A is the published Medicare allowable rate at the end of the reported quarter for the Lupus Monito ring Product, and B is the published Medicare allowable rate at the end of the reported quarter for all other components or products in the Combination Product . If the Lupus Monitoring Product and/or the other components or products of the Combination Prod uct do not correspond with Medicare allowable rates, Net Sales for the Combination Product shall be determined by the parties in good faith and such agreement shall be reduced to writing by both parties