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In a number of cases, the statistics on payments and payment systems are not directly comparable to data presented in previous editions of the Blue Book Addendum. In order to help users to better understand these changes, the “Detailed explanatory notes” in the Blue Book Addendum contain the detailed user requirements applied, descriptions of the tables and comparisons of the enhanced statistics with those in previous Blue Book Addenda and with the “Statistics on payment and settlement systems in selected countries” (the “Red Book”) published by the Bank for International Settlements (BIS). In addition, the Blue Book Addendum also contains for each country a list of remaining discrepancies between the enhanced requirements as outlined in the “Detailed explanatory notes” and the actual data provided.