(18)Article 255(9), point (b), of Regulation (EU) No 575/2013 allows for the use of proxy data where sufficient accurate or reliable data on the pool of underlying exposures are not available. Proxy data for those purposes should be understood as any data that do not directly refer to the securitised exposures, or to the portfolio underwritten on the basis of similar underwriting standards of the originator or original lender from which they have been extracted. Furthermore, Part Three, Title II, Chapter 3, of Regulation (EU) No 575/2013 provides that internal, external and pooled data may be used for the calculation of capital requirements for purchased receivables under the credit risk approach. Those data should therefore also be allowed as proxy data for the calculation of K IRB of qualifying securitised exposures.