void histogramm()
{
  TH1F* h = new TH1F( "h", "Histogramm", 5, 0, 10 );
  float data[10] = { 1.3, 5.4, 3.2, 5.5, 8.2, 8.9, 9.0, 1.2, 0.1, 11 };
  for( int i = 0; i < 10; ++i ) {
    h->Fill( data[i] );
  }
  h->Draw();
}