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");

%jsroot on
gROOT->GetListOfCanvases()->Draw()