2010-07-02 20:49:30 +02:00
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/*
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transfer_camb.cc - This file is part of MUSIC -
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a code to generate multi-scale initial conditions
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for cosmological simulations
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Copyright (C) 2010 Oliver Hahn
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2010-11-17 01:41:40 +01:00
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*/
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2010-07-02 20:49:30 +02:00
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#include "transfer_function.hh"
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class transfer_CAMB_plugin : public transfer_function_plugin
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{
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private:
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std::string m_filename_Pk, m_filename_Tk;
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std::vector<double> m_tab_k, m_tab_Tk_tot, m_tab_Tk_cdm, m_tab_Tk_baryon;
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gsl_interp_accel *acc_tot, *acc_cdm, *acc_baryon;
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gsl_spline *spline_tot, *spline_cdm, *spline_baryon;
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2013-04-07 21:59:43 +02:00
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double m_kmin, m_kmax;
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unsigned m_nlines;
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2010-07-02 20:49:30 +02:00
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void read_table( void ){
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#ifdef WITH_MPI
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if( MPI::COMM_WORLD.Get_rank() == 0 ){
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#endif
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std::cerr
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<< " - reading tabulated transfer function data from file \n"
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<< " \'" << m_filename_Tk << "\'\n";
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std::string line;
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std::ifstream ifs( m_filename_Tk.c_str() );
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2010-08-22 04:43:21 +02:00
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if(! ifs.good() )
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throw std::runtime_error("Could not find transfer function file \'"+m_filename_Tk+"\'");
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2010-07-02 20:49:30 +02:00
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m_tab_k.clear();
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m_tab_Tk_tot.clear();
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m_tab_Tk_cdm.clear();
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m_tab_Tk_baryon.clear();
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2013-04-07 21:59:43 +02:00
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m_kmin = 1e30;
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m_kmax = -1e30;
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m_nlines = 0;
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2010-07-02 20:49:30 +02:00
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while( !ifs.eof() ){
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getline(ifs,line);
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if(ifs.eof()) break;
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std::stringstream ss(line);
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double k, Tkc, Tkb, Tkg, Tkr, Tknu, Tktot;
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ss >> k;
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ss >> Tkc;
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ss >> Tkb;
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ss >> Tkg;
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ss >> Tkr;
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ss >> Tknu;
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ss >> Tktot;
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2013-04-07 21:59:43 +02:00
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if( k < m_kmin ) m_kmin = k;
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if( k > m_kmax ) m_kmax = k;
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2010-07-02 20:49:30 +02:00
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m_tab_k.push_back( log10(k) );
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m_tab_Tk_tot.push_back( log10(Tktot) );
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m_tab_Tk_baryon.push_back( log10(Tkb) );
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m_tab_Tk_cdm.push_back( log10(Tkc) );
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2013-04-07 21:59:43 +02:00
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++m_nlines;
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2010-07-02 20:49:30 +02:00
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}
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ifs.close();
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#ifdef WITH_MPI
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}
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unsigned n=m_tab_k.size();
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MPI::COMM_WORLD.Bcast( &n, 1, MPI_UNSIGNED, 0 );
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if( MPI::COMM_WORLD.Get_rank() > 0 ){
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m_tab_k.assign(n,0);
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m_tab_Tk_tot.assign(n,0);
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m_tab_Tk_cdm.assign(n,0);
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m_tab_Tk_baryon.assign(n,0);
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}
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MPI::COMM_WORLD.Bcast( &m_tab_k[0], n, MPI_DOUBLE, 0 );
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MPI::COMM_WORLD.Bcast( &m_tab_Tk_tot[0], n, MPI_DOUBLE, 0 );
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MPI::COMM_WORLD.Bcast( &m_tab_Tk_cdm[0], n, MPI_DOUBLE, 0 );
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MPI::COMM_WORLD.Bcast( &m_tab_Tk_baryon[0], n, MPI_DOUBLE, 0 );
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#endif
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}
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public:
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2010-11-13 00:05:45 +01:00
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transfer_CAMB_plugin( config_file& cf )
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: transfer_function_plugin( cf )
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2010-07-02 20:49:30 +02:00
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{
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m_filename_Tk = pcf_->getValue<std::string>("cosmology","transfer_file");
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read_table( );
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acc_tot = gsl_interp_accel_alloc();
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acc_cdm = gsl_interp_accel_alloc();
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acc_baryon = gsl_interp_accel_alloc();
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2010-11-13 00:05:45 +01:00
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spline_tot = gsl_spline_alloc( gsl_interp_cspline, m_tab_k.size() );
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spline_cdm = gsl_spline_alloc( gsl_interp_cspline, m_tab_k.size() );
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spline_baryon = gsl_spline_alloc( gsl_interp_cspline, m_tab_k.size() );
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2010-10-26 20:37:31 +02:00
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2010-07-02 20:49:30 +02:00
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gsl_spline_init (spline_tot, &m_tab_k[0], &m_tab_Tk_tot[0], m_tab_k.size() );
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gsl_spline_init (spline_cdm, &m_tab_k[0], &m_tab_Tk_cdm[0], m_tab_k.size() );
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gsl_spline_init (spline_baryon, &m_tab_k[0], &m_tab_Tk_baryon[0], m_tab_k.size() );
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tf_distinct_ = true;
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2010-11-03 07:35:57 +01:00
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tf_withvel_ = false;
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2010-07-02 20:49:30 +02:00
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}
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~transfer_CAMB_plugin()
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{
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gsl_spline_free (spline_tot);
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gsl_spline_free (spline_cdm);
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gsl_spline_free (spline_baryon);
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gsl_interp_accel_free (acc_tot);
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gsl_interp_accel_free (acc_cdm);
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gsl_interp_accel_free (acc_baryon);
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}
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2013-04-07 21:59:43 +02:00
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// linear interpolation in log-log
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inline double extrap_right( double k, const tf_type& type )
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{
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double v1(1.0), v2(1.0);
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int n=m_tab_k.size()-1, n1=n-1;
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switch( type )
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{
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case cdm:
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v1 = m_tab_Tk_cdm[n1];
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v2 = m_tab_Tk_cdm[n];
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break;
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case baryon:
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v1 = m_tab_Tk_baryon[n1];
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v2 = m_tab_Tk_baryon[n];
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break;
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case vcdm:
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case vbaryon:
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case total:
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v1 = m_tab_Tk_tot[n1];
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v2 = m_tab_Tk_tot[n];
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break;
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default:
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throw std::runtime_error("Invalid type requested in transfer function evaluation");
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}
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double lk = log10(k);
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double dk = m_tab_k[n]-m_tab_k[n1];
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double delk = lk-m_tab_k[n];
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return pow(10.0,(v2-v1)/dk*(delk)+v2);
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}
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inline double compute( double k, tf_type type )
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{
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// use constant interpolation on the left side of the tabulated values
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if( k < m_kmin )
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{
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if( type == cdm )
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return pow(10.0,m_tab_Tk_cdm[0]);
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else if( type == baryon )
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return pow(10.0,m_tab_Tk_baryon[0]);
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return pow(10.0,m_tab_Tk_tot[0]);
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}
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// use linear interpolation on the right side of the tabulated values
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else if( k>m_kmax )
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return extrap_right( k, type );
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double lk = log10(k);
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2010-07-02 20:49:30 +02:00
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if( type == cdm )
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2010-08-22 04:43:21 +02:00
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return pow(10.0, gsl_spline_eval (spline_cdm, lk, acc_cdm) );
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2010-11-19 07:30:16 +01:00
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if( type == baryon )
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return pow(10.0, gsl_spline_eval (spline_baryon, lk, acc_baryon) );
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2010-07-02 20:49:30 +02:00
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2010-11-19 07:30:16 +01:00
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return pow(10.0, gsl_spline_eval (spline_tot, lk, acc_tot) );
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2010-07-02 20:49:30 +02:00
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}
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inline double get_kmin( void ){
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return pow(10.0,m_tab_k[1]);
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}
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inline double get_kmax( void ){
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return pow(10.0,m_tab_k[m_tab_k.size()-2]);
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}
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};
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namespace{
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transfer_function_plugin_creator_concrete< transfer_CAMB_plugin > creator("camb_file");
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}
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