int farad_1(){
	gROOT->SetStyle("Plain");
	gStyle->SetOptFit(00001);

//FARADAY john 1	
	TGraphErrors fj1("messdaten/faraday_j_1.txt","%lg %lg");
	fj1.SetTitle("Faradayeffekt-john 1;I/A;Angel/#circ");
	fj1.SetMarkerStyle(3);
	
	//fit
	TF1 fitfj1("Linear law","[0]+x*[1]",-5,5);
	fitfj1.SetLineColor(kRed); fitfj1.SetLineStyle(2);
 	fitfj1.SetParName(0,"Y-Intersect")
 	fitfj1.SetParName(1,"Slope")
	fj1.Fit(&fitfj1);

	double par1 = fitfj1.GetParameter(0);
   	double err1 = fitfj1.GetParError(0); 
	double par2 = fitfj1.GetParameter(1);
   	double err2 = fitfj1.GetParError(1); 
	
	std::cout << endl;
	std::cout << endl;		

	std::cout << "Y-intersect: " << par1 << endl;
	std::cout << "Y-intersect error: " << err1 << endl;
	std::cout << "Slope " << par2 << endl;
	std::cout << "Slope error " << err2 << endl;

	std::cout << endl;	
	std::cout << endl;

//FARADAY john 2
	TGraphErrors fj2("messdaten/faraday_j_2.txt","%lg %lg");
	fj2.SetTitle("Faradayeffekt-john 2;I/A;Angel/#circ");
	fj2.SetMarkerStyle(3);

	
	//fit
	TF1 fitfj2("Linear law","[0]+x*[1]",-5,5);
	fitfj2.SetLineColor(kRed); fitfj2.SetLineStyle(2);
	fj2.Fit(&fitfj2);

	
//FARADAY smith 1
	TGraphErrors fs1("messdaten/faraday_s_1.txt","%lg %lg");
	fs1.SetTitle("Faradayeffekt-smith 1;I/A;Angel/#circ");
	fs1.SetMarkerStyle(3);
	
	//fit
	TF1 fitfs1("Linear law","[0]+x*[1]",-5,5);
	fitfs1.SetLineColor(kRed); fitfs1.SetLineStyle(2);
	fs1.Fit(&fitfs1);

	
//FARADAY smith 2
	TGraphErrors fs2("messdaten/faraday_s_2.txt","%lg %lg");
	fs2.SetTitle("Faradayeffekt-smith 2;I/A;Angel/#circ");
	fs2.SetMarkerStyle(3);
	
	//fit
	TF1 fitfs2("Linear law","[0]+x*[1]",-5,5);
	fitfs2.SetLineColor(kRed); fitfs2.SetLineStyle(2);
	fs2.Fit(&fitfs2);



	TCanvas* c=new TCanvas("Canvas","Canvas",800,800);
	c->Divide(2,2);
	c->cd(1);fj1.DrawClone("AP");
//	c->cd(1);legfj1.DrawClone("Same");
	c->cd(2);fj2.DrawClone("AP");
//	c->cd(2);fitfj2.DrawClone("Same");
	c->cd(3);fs1.DrawClone("AP");
//	c->cd(3);fitfs1.DrawClone("Same");
	c->cd(4);fs2.DrawClone("AP");
//	c->cd(4);fitfs2.DrawClone("Same");
	c->cd(1)->SetGridx();
	c->cd(1)->SetGridy();
	c->cd(2)->SetGridx();
	c->cd(2)->SetGridy();
	c->cd(3)->SetGridx();
	c->cd(3)->SetGridy();
	c->cd(4)->SetGridx();
	c->cd(4)->SetGridy();

	c->Print("Faradayeffekt.pdf");
}