void event()
{
   TCanvas *c1 = new TCanvas("c1", "ROOT Event description", 700, 500);
   c1->Range(0, 0, 14, 15.5);
   TPaveText *event = new TPaveText(1, 13, 3, 15);
   event->SetFillColor(11);
   event->Draw();
   event->AddText("Event");
   TLine *line = new TLine(1.1, 13, 1.1, 1.5);
   line->SetLineWidth(2);
   line->Draw();
   line->DrawLine(1.3, 13, 1.3, 3.5);
   line->DrawLine(1.5, 13, 1.5, 5.5);
   line->DrawLine(1.7, 13, 1.7, 7.5);
   line->DrawLine(1.9, 13, 1.9, 9.5);
   line->DrawLine(2.1, 13, 2.1, 11.5);
   TArrow *arrow = new TArrow(1.1, 1.5, 3.9, 1.5, 0.02, "|>");
   arrow->SetFillStyle(1001);
   arrow->SetFillColor(1);
   arrow->Draw();
   arrow->DrawArrow(1.3, 3.5, 3.9, 3.5, 0.02, "|>");
   arrow->DrawArrow(1.5, 5.5, 3.9, 5.5, 0.02, "|>");
   arrow->DrawArrow(1.7, 7.5, 3.9, 7.5, 0.02, "|>");
   arrow->DrawArrow(1.9, 9.5, 3.9, 9.5, 0.02, "|>");
   arrow->DrawArrow(2.1, 11.5, 3.9, 11.5, 0.02, "|>");
   TPaveText *p1 = new TPaveText(4, 1, 11, 2);
   p1->SetTextAlign(12);
   p1->SetFillColor(42);
   p1->AddText("1 Mbyte");
   p1->Draw();
   TPaveText *p2 = new TPaveText(4, 3, 10, 4);
   p2->SetTextAlign(12);
   p2->SetFillColor(42);
   p2->AddText("100 Kbytes");
   p2->Draw();
   TPaveText *p3 = new TPaveText(4, 5, 9, 6);
   p3->SetTextAlign(12);
   p3->SetFillColor(42);
   p3->AddText("10 Kbytes");
   p3->Draw();
   TPaveText *p4 = new TPaveText(4, 7, 8, 8);
   p4->SetTextAlign(12);
   p4->SetFillColor(42);
   p4->AddText("1 Kbytes");
   p4->Draw();
   TPaveText *p5 = new TPaveText(4, 9, 7, 10);
   p5->SetTextAlign(12);
   p5->SetFillColor(42);
   p5->AddText("100 bytes");
   p5->Draw();
   TPaveText *p6 = new TPaveText(4, 11, 6, 12);
   p6->SetTextAlign(12);
   p6->SetFillColor(42);
   p6->AddText("10 bytes");
   p6->Draw();
   TText text;
   text.SetTextAlign(12);
   text.SetTextSize(0.04);
   text.SetTextFont(72);
   text.DrawText(6.2, 11.5, "Header:Event_flag");
   text.DrawText(7.2, 9.5, "Trigger_Info");
   text.DrawText(8.2, 7.5, "Muon_Detector: TOF");
   text.DrawText(9.2, 5.5, "Calorimeters");
   text.DrawText(10.2, 3.5, "Forward_Detectors");
   text.DrawText(11.2, 1.5, "TPCs");
}