text: /**
   * \copyright
   * Copyright (c) 2018, OpenGeoSys Community (http://www.opengeosys.org)
   *            Distributed under a Modified BSD License.
   *              See accompanying file LICENSE.txt or
   *              http://www.opengeosys.org/project/license
   *
   */
  
  #include <string>
  
  // using namespace std;
  
  class PITZdata
  {
  private:
  public:
      PITZdata(void);
      ~PITZdata(void);
      // method
      static double charge(std::string N);
      static double pitzer_parameters(double T, double P,
                                      std::string param_switch);
  };
  