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diff --git a/concept/Persistence_representations/Real_valued_topological_data.h b/concept/Persistence_representations/Real_valued_topological_data.h
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-/*    This file is part of the Gudhi Library. The Gudhi library
- *    (Geometric Understanding in Higher Dimensions) is a generic C++
- *    library for computational topology.
- *
- *    Author(s):       Pawel Dlotko
- *
- *    Copyright (C) 2016 Inria
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU General Public License as published by
- *    the Free Software Foundation, either version 3 of the License, or
- *    (at your option) any later version.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU General Public License for more details.
- *
- *    You should have received a copy of the GNU General Public License
- *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef CONCEPT_REAL_VALUED_TOPOLOGICAL_DATA_H_
-#define CONCEPT_REAL_VALUED_TOPOLOGICAL_DATA_H_
-
-namespace Gudhi {
-
-namespace Persistence_representations {
-
-/** \brief The concept Real_valued_topological_data describes the requirements
-  * for a type to implement a container that allows computations of its projections to R.
-  */
-class Real_valued_topological_data {
- public:
-  /**
-* Typically there are various ways data can be projected to R. This function gives us the number of functions for
-* vectorization provided by a given class.
-  **/
-  size_t number_of_projections_to_R();
-  /**
-* This is a function to compute the projection from this container to reals. The parameter of a function have to
-* be between 0 and the value returned by number_of_projections_to_R().
-**/
-  double project_to_R(size_t number_of_projection);
-};
-
-}  // namespace Persistence_representations
-
-}  // namespace Gudhi
-
-#endif  // CONCEPT_REAL_VALUED_TOPOLOGICAL_DATA_H_