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* $Id: dlsqp2.f,v 1.1 2009/07/30 22:46:16 madgraph Exp $
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* Revision 1.1 2009/07/30 22:46:16 madgraph
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* JA: Implemented CKKW-style matching with Pythia pT-ordered showers
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* Revision 1.1.1.1 1996/04/01 15:02:24 mclareni
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SUBROUTINE DLSQP2(N,X,Y,A0,A1,A2,SD,IFAIL)
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IMPLICIT DOUBLE PRECISION (A-H,O-Z)
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DET=(FN*SXXXX-SXX**2)*SXX-FN*SXXX**2
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A2=(SXX*(FN*SXXY-SXX*SY)-FN*SXXX*SXY)/DET
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IF(IFAIL .EQ. 0 .AND. N .GT. 3)
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1 SD=SQRT(MAX(R0,SYY-A0*SY-A1*SXY-A2*SXXY)/(N-3))