diff --git a/root/background.root b/root/background.root
new file mode 100644
index 0000000..3cda804
Binary files /dev/null and b/root/background.root differ
diff --git a/root/cuts b/root/cuts
new file mode 100644
index 0000000..b38a813
--- /dev/null
+++ b/root/cuts
@@ -0,0 +1,8 @@
+px: < -50; > 50
+py: < -50; > 50
+pz: < 100 !
+E: > 100 !
+
+pt: > 65; < 85
+eta: ?
+phi: ?
diff --git a/root/exc4.cc b/root/exc4.cc
new file mode 100644
index 0000000..bcc61e6
--- /dev/null
+++ b/root/exc4.cc
@@ -0,0 +1,96 @@
+#include "TROOT.h"
+#include "TFile.h"
+#include "TTree.h"
+#include "TH1F.h"
+#include "TH2D.h"
+#include "TLorentzVector.h"
+#include <iostream>
+#include <vector>
+
+bool inSelection(const TLorentzVector& v) {
+    return v.E() > 110
+            && v.Pz() < 90
+            && v.Pt() < 80 && v.Pt() > 65;
+}
+
+void exc4() {
+    using namespace std;
+
+    Double_t px, py, pz, E;
+    TFile* f = new TFile("signal.root");
+    TTree* tree;
+    f->GetObject("stree", tree);
+    auto px_branch = tree->GetBranch("px"); px_branch->SetAddress(&px);
+    auto py_branch = tree->GetBranch("py"); py_branch->SetAddress(&py);
+    auto pz_branch = tree->GetBranch("pz"); pz_branch->SetAddress(&pz);
+    auto e_branch = tree->GetBranch("E"); e_branch->SetAddress(&E);
+
+    Double_t bpx, bpy, bpz, bE;
+    TFile* f2 = new TFile("background.root");
+    TTree* tree2;
+    f2->GetObject("btree", tree2);
+    auto bpx_branch = tree2->GetBranch("px"); bpx_branch->SetAddress(&bpx);
+    auto bpy_branch = tree2->GetBranch("py"); bpy_branch->SetAddress(&bpy);
+    auto bpz_branch = tree2->GetBranch("pz"); bpz_branch->SetAddress(&bpz);
+    auto be_branch = tree2->GetBranch("E"); be_branch->SetAddress(&bE);
+
+
+    TH1D* signal = new TH1D("spx", "Signal E", 100, 0, 0);
+    TH1D* background = new TH1D("bpx", "Background py", 100, 0, 0);
+
+    TH2D* signal2 = new TH2D("s2d", "Signal 2D", 100, 0, 0, 100, 0, 0);
+    TH2D* background2 = new TH2D("b2d", "Background 2D", 100, 0, 0, 100, 0, 0);
+
+    vector<TLorentzVector> events, selection;
+    assert(tree->GetEntries() == tree2->GetEntries());
+    int backgrounds = 0, signals = 0;
+    int N = tree->GetEntries();
+    for (int i = 0; i < N; ++i) {
+        px_branch->GetEntry(i);
+        py_branch->GetEntry(i);
+        pz_branch->GetEntry(i);
+        e_branch->GetEntry(i);
+
+        bpx_branch->GetEntry(i);
+        bpy_branch->GetEntry(i);
+        bpz_branch->GetEntry(i);
+        be_branch->GetEntry(i);
+
+        TLorentzVector vsignal;
+        TLorentzVector vbackground;
+
+        vsignal.SetPxPyPzE(px, py, pz, E);
+        vbackground.SetPxPyPzE(bpx, bpy, bpz, bE);
+
+        signal->Fill(vsignal.E());
+        background->Fill(vbackground.E());
+
+        signal2->Fill(vsignal.Pt(), vsignal.Eta());
+        background2->Fill(vbackground.Pt(), vbackground.Pt());
+
+        events.push_back(vsignal);
+        events.push_back(vbackground);
+        if (inSelection(vsignal)) {
+            selection.push_back(vsignal);
+        } else {
+            signals++;
+        }
+        if (inSelection(vbackground)) {
+            backgrounds++;
+            selection.push_back(vbackground);
+        }
+    }
+    cout << "Selection: " << selection.size() << endl
+        << "False positive: " << backgrounds << endl
+        << "False negative: " << signals << endl;
+
+    signal2->SetLineColor(kRed);
+    signal2->SetFillColor(kRed);
+    signal2->SetMarkerColor(kRed);
+    signal2->Draw();
+    background2->Draw("Same");
+}
+
+int main() {
+    exc4();
+}
diff --git a/root/macro.C b/root/macro.C
index 45b6a44..d71876e 100644
--- a/root/macro.C
+++ b/root/macro.C
@@ -21,7 +21,8 @@ void macro() {
   combined->SetParameter(4, 0.004);
   combined->SetParameter(5, 173);
   combined->SetParameter(6, 10);
-  cout << "X^2: " << h->Chisquare(combined) << endl;
+  h->Fit(combined, "", "", 0, 300);
+  cout << "X^2: " << h->Chisquare(combined) / (h->GetNbinsX() - 7)<< endl;
   //cout << background->GetParameters() << endl;
   background->SetLineColor(kRed);
   h->Draw();
diff --git a/root/signal.root b/root/signal.root
new file mode 100644
index 0000000..a058594
Binary files /dev/null and b/root/signal.root differ
diff --git a/taylor b/taylor
index 12b975b..86caed2 100755
Binary files a/taylor and b/taylor differ
diff --git a/taylor.cpp b/taylor.cpp
index 6d8d6fb..72d0459 100644
--- a/taylor.cpp
+++ b/taylor.cpp
@@ -19,20 +19,27 @@ double sin_taylor(double x, int N) {
     return res;
 }
 void find_interval(int N) {
-    for (double x = 0; x < 3.14; x += 0.00000001) {
+    const double precision = 0.0000001;
+    for (double x = 0; x <= 3.14; x += precision) {
         double real = sin(x);
         double taylor = sin_taylor(x, N);
         //cout << "Real: " << real << " Taylor: " << taylor << endl;
         if (abs(real - taylor) > 0.001) {
-            cout << "Interval: [0, " << x - 0.01 << "]" << endl;
-            break;
+            cout << "Interval: [0, " << x - precision << "]" << endl;
+            return;
         }
     }
+    cout << "Interval: [0, 3.14]" << endl;
 }
 
-int main(int argc, char* argv[]) {
-    find_interval(1);
+int main() {
+    int N;
+    cout << "Gib Dein N ein: ";
+    cin >> N;
+    cout << "Interval für N: " << endl;
+    find_interval(N);
+    /*find_interval(1);
     find_interval(2);
-    find_interval(3);
+    find_interval(3);*/
     return 0;
 }