definiens: means, for any period, the aggregate amounts in IUs of ( i ) EPOGEN purchased by allDialysis Center Committed Purchasers, ( ii ) Aranesp ( in equivalent IUs of EPOGEN using the Aranesp - EPOGEN Dose EquivalencyRatio ) purchased by Added Aranesp Dialysis Center Purchasers that are Dialysis Center Committed Purchasers, and ( iii ) Aranesp(in equivalent IUs of EPOGEN using the Aranesp - EPOGEN Dose Equivalency Ratio ) purchased by Dialysis Center CommittedPurchasers [ * ] percent ( [ * ] % ) [ * ] ( the ), during such period for use in providing Dialysis Services, netExhibit 10.40Note : Redacted portions have been marked with [ * ] . The redacted portions are subject to a request for confidential treatment that has been filed withthe Securities and Exchange Commission