definiens: means, for any particular Calendar Quarter, the ratio of total prescriptions written for the Products by PUDs to the total prescriptions written for the Products, based upon data published by IMS Health for such period . If IMS Health data is not available, Wolters Kluwer prescription data will be used by the Parties . If neither IMS Health nor Wolters Kluwer data is available, the last available PUD Prescription Ratio will be used for the remainder of the Term . For example, in order to calculate the PUD Prescription Ratio for the third calendar quarter of 2008 ( July 1, 2008 through September 30, 2008 ), the total number of prescriptions written by PUDs for the Products Cl1Q1 ) is divided by the number of total prescriptions written for the Products ( 13,876 ) to arrive at the PUD Prescription Ratio, which is 26.7 % ( actual data from IMS Health NPA, including LTC, used for this example ) . For comparison, PUD Prescription Ratio using Wolters Kluwer data for this same quarter was 26 .. 20/0 ~ divided by 14,229 )