Fit gaussian and exponential in the same plot

Here I want to fit the exponential and Gaussian together, but I don’t get a desired outline of the histogram.
Can you please point out the mistake ?

void f1()
	TH1F *h4 = new TH1F("h4","Exponential+Gaussian",100,-1.,6.);
	TF1 *f1 = new TF1("f1", "expo");
  	f1->SetParameter(0, 3);
  	f1->SetParameter(1, -0.3);
 	TF1 *f2 = new TF1("f2", "gaus");
   	f2->SetParameters(1, 2.1, 0.67);
	TCanvas *c4 = new TCanvas("c4","Fit-1",800,600);
	TF1 *fit1 = new TF1("fit1","f1",-1.,1.3);
        TF1 *fit2 = new TF1("fit2","f2",1.3,3.);
	TF1 *fit3 = new TF1("fit3","f1",3.,6.);

ROOT Version: 6.27/01
Platform: Linux
Compiler: C++17

	h4->Fit(fit1, "R");
	h4->Fit(fit2, "R+");
	h4->Fit(fit3, "R+");

Thank you. It works, but I am getting a break in the line (as expected).
Is there any way to get a continuous curve , by this method (without specifying the range)?

TF1 *f = new TF1("f", "gaus(0) + expo(3)", 0., 1.); // "range" is unimportant
f->SetParameters(600., 2., 0.7, 8., -0.3); // "reasonable" initial parameters

Yes, it works perfect.
Actually , this is a very easy method as compared to the tutorial examples.
Thank you so much.

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