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The systematic uncertainty on the W mass and width measurement resulting fromthe imperfect knowledge of electroweak radiative corrections is discussed. Theintrinsic uncertainty in the 4-f generator used by the DELPHI Collaboration isstudied following the guidelines of the authors of YFSWW, on which itsradiative corrections part is based. The full DELPHI simulation, reconstructionand analysis chain is used for the uncertainty assessment. A comparison withthe other available 4-f calculation implementing DPA O(alpha) corrections,RacoonWW, is also presented. The uncertainty on the W mass is found to be below10 MeV for all the WW decay channels used in the measurement.Comment: 34 pages, 3 figure

Electroweak corrections uncertainty on the W mass measurement at LEP