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/usr/include/root/TMatrixF.h is in libroot-math-matrix-dev 5.34.30-0ubuntu8.

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/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TMatrixF
#define ROOT_TMatrixF

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TMatrixF                                                             //
//                                                                      //
//  Instantation of TMatrixT<Float_t>                                   //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#ifndef ROOT_TMatrixT
#include "TMatrixT.h"
#endif
#ifndef ROOT_TMatrixFfwd
#include "TMatrixFfwd.h"
#endif
#ifndef ROOT_TMatrixFUtils
#include "TMatrixFUtils.h"
#endif

#endif